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Hội nghị Vật lý lý thuyết toàn quốc lần thứ 35

1 Tp. Hồ Chí Minh, 02-06/8/2010

2

HỘI NGHỊ VẬT LÝ LÝ THUYẾT TOÀN QUỐC LẦN THỨ 35

(Tp. Hồ Chí Minh, 02 – 06/8/2010)

Chủ tịch danh dự

Nguyễn Văn Hiệu (VKHCN VN)

Chủ tịch Hội nghị

Nguyễn Ái Việt (VVL HN) Nguyễn Viết Ngoạn (ĐHSG Tp. HCM)

Ban Tổ chức

Nguyễn Hồng Quang (VVL HN), Trưởng ban Hoàng Dũng (ĐHQG Tp. HCM), Phó Trưởng ban Lê Văn Hoàng (ĐHSP Tp. HCM), Phó Trưởng ban Bạch Thành Công (ĐHKHTN HN) Hồ Trung Dũng (VVL Tp. HCM) Trương Minh Đức (ĐHSP Huế) Phó Thị Nguyệt Hằng (ĐHBK HN) Trịnh Xuân Hoàng (VVL HN) Đinh Xuân Khoa (ĐH Vinh) Võ Văn Lộc (ĐHSG Tp. HCM) Đặng Văn Soa (ĐHSP HN) Lưu Thị Kim Thanh (ĐHSP HN II) Hoàng Anh Tuấn (VVL HN)

Ban chương trình

Nguyễn Văn Liễn (VVL HN), Trưởng ban Nguyễn Bá Ân (VVL HN) Đàm Hiếu Chí (ĐHKHTN HN) Võ Văn Hoàng (ĐHBK Tp. HCM) Vũ Văn Hùng (ĐHSP HN) Nguyễn Quốc Khánh (ĐHKHTN Tp. HCM) Hoàng Ngọc Long (VVL HN) Đỗ Hoàng Sơn (ĐHKHTN Tp. HCM)


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Ban Tổ chức địa phương

Võ Văn Lộc (ĐHSG Tp. HCM), Trưởng ban Võ Thành Lâm (ĐHSG Tp. HCM), Phó trưởng ban Lê Thị Thanh Thủy (ĐHSG Tp. HCM), Thư ký

Phụ trách biên tập kỷ yếu Hội nghị

Nguyễn Toàn Thắng (VVL HN)

Thư ký Hội nghị

Đào Thị Hồng (VVL HN)

Tp. Hồ Chí Minh, 02-06/8/2010

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Cơ quan tổ chức

Đại học Sài Gòn, Tp. Hồ Chí Minh

Trung tâm Vật lý lý thuyết, Viện Vật lý, Hà Nội

Cơ quan tài trợ

Đại học Sài Gòn, Tp. Hồ Chí Minh

Trung tâm Vật lý lý thuyết và Viện Vật lý, Hà Nội

Viện Khoa học và Công nghệ Việt Nam

Trường Đại học Sư phạm Tp. Hồ Chí Minh

Trường Đại học Khoa học Tự nhiên Tp. Hồ Chí Minh

Đại học Vinh


5

CHƯƠNG TRÌNH HỘI NGHỊ

Tp. Hồ Chí Minh, 02-06/8/2010

6

Chương trình khung

Chương trình chi tiết

Thứ Hai, ngày 02 tháng 08 năm 2010

BUỔI SÁNG:

08h00 – 09h00: Đăng ký đại biểu

08h00 – 08h30: Văn nghệ

09h00 – 10h00: Khai mạc

10h00 – 10h30: Nghỉ giữa buổi, chụp ảnh lưu niệm

10h30 – 11h30: Phần trình bày báo cáo mời Mỗi báo cáo trình bày 30’ Chủ tọa: Hoang Dung

Bruce McKellar, Neutrinos, Scalars and Dark Energy Người trình bày: Bruce McKellar – Báo cáo mời

Nguyen Van Hieu and Nguyen Bich Ha, Engineered Spin Chains for

Perfect Quantum State Transfer Người trình bày: Nguyen Van Hieu - Báo cáo mời

Tiệc chiêu đãi bữa trưa


7

BUỔI CHIỀU:

14h00 – 15h00: Phần trình bày báo cáo miệng Mỗi báo cáo trình bày 20’

Chủ tọa: Doan Nhat Quang

Ho Trung Dung, Detecting Entanglement with non‐Hermitian

Operators Người trình bày: Ho Trung Dung

Dinh Xuan Khoa, Nguyen Tien Dung, Pham Van Trong, and Nguyen Huy

Bang, Construction of Potential Energy Curves for Diatomic

Molecules by the Inverted Perturbation Approach. Người trình bày: Nguyen Huy Bang

Ho Quang Quy, Bui Sy Khiem, Nguyen Thi Ha Trang, Chu Van Lanh,

Distributuion of the Laser Intensity and the Force acting on

Dielectric Nano‐Particle in the 3D‐Optical Trap using

Counter‐propagating Pulsed Laser Beams Người trình bày: Ho Quang Quy

15h00 – 16h00: Nghỉ giữa buổi và Phần trình bày báo cáo treo I

Chủ tọa: Nguyen Nhu Dat

[P-1] Le Phuong Thao and Nguyen Dinh Dung, Inelastic Scattering of

Polarized Neutrons in Magnetic Helicoidal Structure Crystal

in Presence of Radiation and Absorption of Phonon Người trình bày: Le Phuong Thao

[P-2] Trieu Quynh Trang, Nguyen Thi Thu Huong, and Ha Huy Bang,

Impact of CP Phases on the Gluino Production Process in

Electron‐ Positron Annihilation Người trình bày: Trieu Quynh Trang

Tp. Hồ Chí Minh, 02-06/8/2010

8

[P-3] Vu Xuan Chung and Nguyen Dinh Dung, Scattering of Polarized

Neutrons in Ferromagnetic Crystal in Presence of Radiation

and Absorption of Phonon Người trình bày: Vu Xuan Chung

[P-4] P. V. Dong, H. N. Long, D. V. Soa, and N. H.Thao, Photon‐

Radion Conversion Cross‐Sections in External

Electromagnetic Field Người trình bày: Dang Van Soa/Hoang Ngoc Long

[P-5] Dinh Nhu Thao and Tran Thien Lan, 3D Monte Carlo

Simulation of GaAs p‐i‐n Diodes taking into account the

near Coulomb Interaction between Electrons and Holes Người trình bày: Tran Thien Lan

[P-6] Pham Quang Hung and Nguyen Nhu Le, The Higgs Effective

Potential in the Electroweak‐Scale Right‐Handed Neutrinos

Model Người trình bày: Nguyen Nhu Le

[P-7] Dao Vong Duc and Nguyen Thi Ha Loan, Generally Covariant

Duality and Gravitational Scalar Field Người trình bày: Nguyen Thi Ha Loan

[P-8] Tran Huu Phat, Nguyen Van Long, Nguyen Tuan Anh, Le Viet Hoa,

and Nguyen Chinh Cuong, The Energy of the Asymmetric Nuclear

Matter in the four‐Nucleon Model Người trình bày: Nguyen Van Long

[P-9] N.T. Thuong, N.V. Minh, N.N. Tuan & V.N. Tuoc, Density

Functional Based Tight Binding Study on Wurzite Core‐shell

Nanowires Heterostructures ZnO/ZnS. Người trình bày: Nguyen Thi Thuong

[P-10] Nguyen Tri Lan, Ginzburg – Landau Functional for the

Coexistence of many Phases in many – Body Systems Người trình bày: Nguyen Tri Lan


9

[P-11] Tran Nguyen Dung, Conductance and Shot Noise in gate‐

Controlled Zigzag Graphene Nanoribbons Người trình bày: Tran Nguyen Dung

[P-12] Do Manh Hung, Nguyen Quang Bau, and Nguyen Dinh Nam,

Parametric Transformation and Parametric Resonance of

Confined Acoustic Phonons and Confined Optical Phonons

in Quantum Wells Người trình bày: Do Manh Hung

[P-13] Le Hoang Anh, Ho Sy Ta, and Do Van Nam, Effects of

Magnetic Field on the Electronic Structure and Transport

Properties of Graphene and Graphene Nanoribbons Người trình bày: Le Hoang Anh

[P-14] Nguyen Van Nghia, Tran Thi Thu Huong, Nguyen Quang Bau, The

Nonlinear Acoustoelectric Effect in a Cylindrical Quantum

Wire with an Infinite Potential Người trình bày: Nguyen Van Nghia

[P-15] Nguyen Viet Minh, Electron Mobility in an Uninten‐

tionally Doped GaN/AlGaN Surface Quantum Well Người trình bày: Nguyen Viet Minh

[P-16] Pham Thi Thanh Nga and Nguyen Toan Thang, Supersolids of

Hard Core ‐ Bosons on a Triangular Lattice. Người trình bày: Pham Thi Thanh Nga

[P-17] V.T Hoa, T.T.T. Van, T.T. Thao, P.D. Anh, N.V. Thanh, and N.A. Viet

, Simple Model for the Indirect Exciton in a Strong Magnetic

Field Người trình bày: Phan Duc Anh

[P-18] Tran Cong Phong , Le Thi Thu Phuong, Tran Dinh Hien, Rate of

Phonon Excitation and Conditions for Phonon Generation in

Cylindrical Quantum Wires Người trình bày: Tran Cong Phong

Tp. Hồ Chí Minh, 02-06/8/2010

10

[P-19] Nguyen Van Hung, Nguyen Cong Toan, Tong Sy Tien, Nguyen Bao

Trung, A Thermodynamic Lattice Theory on Lindemann’s

Melting Temperature and Eutectic Point of FCC Binary

Alloys Người trình bày: Nguyen Cong Toan

[P-20] Nguyen Quang Hoc and Tran Quoc Dat, Specific Heat at

Constant Volume for Molecular Cryocrystals of Nitrogen

Type Người trình bày: Tran Quoc Dat

[P-21] Vu Van Hung, Hoang Van Thai, and Dinh Quang Vinh, Study of

Elastic Properties of Quantum Crystals by Statistical

Moment Method Người trình bày: Hoang Van Thai

[P-22] Vu Van Hung, Le Dinh Hong, and Nguyen Thu Ha, Study of

Thermodynamic Properties of Zirconium under High

Pressure Người trình bày: Le Dinh Hong

[P-23] Nguyen Thanh Hai, Investigation of Thermodynamic

Properties Liquid Cu – Ni Alloys using Moment Method Người trình bày: Nguyen Thanh Hai

[P-24] Truong Minh Duc and Ngo Thi Thuy Trang, Higher‐order

Properties of two‐Mode Photon‐added Displaced Squeezed

States Người trình bày: Ngo Thi Thuy Trang

[P-25] Van Cao Long, Wieslaw Leoński, and Khoa Doan Quoc,

Photoelectron Spectra Induced by Broad‐Band Chaotic Light

from a Structured Continuum Người trình bày: Cao Long Van


11

[P-26] Wieslaw Leoński, Van Cao Long, and Thuan Bui Dinh,

Electromagnetically Induced Ionization from Double

Autoionizing Levels with Lorentzian Continuum Người trình bày: Cao Long Van

[P-27] Hoang Van Hung, Le Hai My Ngan, Le Thi Cam Tu, Nguyen Ngoc

Ty, Le Van Hoang, Tracking the Keto‐Enol Tautomerism Process

of DNA Base by ultra‐Short Laser Pulses using High

Harmonic Generation Người trình bày: Hoang Van Hung

[P-28] Ho Quang Quy, Vu Ngoc Sau, Nguyen Van Hoa, Nguyen Thi Thanh

Tam , Optical Bistable Effect of two‐port Nonlinear Fiber

Mach‐Zehnder Interferometer Người trình bày: Nguyen Thi Thanh Tam

[P-29] Nguyen Chanh Qui, Pham Hong Phong and Nguyen Vinh Quang,

Các không gian Sobolev và vấn đề các tích phân chuyển

động Người trình bày: Nguyen Chanh Qui

[P-30] Nguyen Tien Dung, Dinh Xuan Khoa, Vu Ngoc Sau, Nguyen Thanh

Vinh, Tran Manh Cuong, and Nguyen Huy Bang, Construction of

Potential Energy Curve for the 3Pi State of NaLi Người trình bày: Nguyen Huy Bang

[P-31] Nguyen Ngoc Ty and Le Van Hoang, Dynamic Chemical

Imaging of Molecule N2 by Tomographic Method using High

Harmonic Generation ‐ Theoretical Analysis of Quality

Improvement. Người trình bày: Nguyen Ngoc Ty

[P-32] Nguyen Phuong Duy Anh, Cao Ho Thanh Xuan, Nguyen Van Hoa,

Le Van Hoang, Operator Method for Exactly Solving

Schrodinger Equation for Atoms Người trình bày: Nguyen Phuong Duy Anh

Tp. Hồ Chí Minh, 02-06/8/2010

12

[P-33] Truong Minh Duc and Nguyen Thi Nguyet, The two‐Mode

Squeezed Pair Coherent States and their Non‐Classical

Properties Người trình bày: Nguyen Thi Nguyet

[P-34] Nguyen Tien Dung, Nguyen Van Thinh, Le Canh Trung, Dinh Xuan

Khoa, and Nguyen Huy Bang, On the Molecular Constants of

Diatomic Molecules Người trình bày: Nguyen Tien Dung

[P-35] Vu Ngoc Tuoc and Nguyen Viet Minh, Density Functional

Based Study on Zinc Oxide Nanoparticles Người trình bày: Nguyen Viet Minh

[P-36] Dinh Nhu Thao and Le Hoai Linh, 3D Monte Carlo Simulation

of Carrier Dynamics and THz Radiation from GaAs p‐i‐n

Diodes Người trình bày: Le Hoai Linh

[P-37] Nguyen Thu Nhan, Nguyen Thi Thanh Ha, and Pham Khac Hung,

Accelerated MD Programm using CUDA Technology Người trình bày: Nguyen Thu Nhan

[P-38] Nguyen Thuy Trang, Nguyen Van Chinh, Bach Thanh Cong, and

Nguyen Hoang Linh, Study on Lattice and Electronic Structure at

the Surface of BaTiO3 Thin Films by DFT Method Người trình bày: Nguyen Van Chinh

[P-39] Phan Hoang Chuong, Phương trình Schrodinger và phương

trình truyền nhiệt Chaos Người trình bày: Phan Hoang Chuong


13

16h00 – 17h00: Phần trình bày báo cáo miệng Mỗi báo cáo trình bày 20’ Chủ tọa: Hoang Ngoc Long

Piotr Rozmej, Effects of Exotic Shapes on Potential Energy

Surface of Superheavy Nuclei Người trình bày: Piotr Rozmej

N. Q. Lan and L. C. Tuong, Cosmic Formation and Decaying Dark

Matter Người trình bày: Nguyen Quynh Lan

Nguyen Vien Tho, To Ba Ha and Nguyen Quoc Hoan, Solutions for

Yang‐Mills Field with Singular Source Terms and Higher

Topological Indices Người trình bày: To Ba Ha

Thứ Ba, ngày 03 tháng 08 năm 2010

BUỔI SÁNG:

08h30 – 10h00: Phần trình bày báo cáo miệng Báo cáo mời 30’, các báo cáo khác 20’

Chủ tọa: Hoang Anh Tuan

Cao Huy Thien, Doan Tri Dung and Tran Thoai Duy Bao, Condensation

Kinetics of Polaritons in Semiconductor Microcavities Người trình bày: Cao Huy Thien – Báo cáo mời

Nguyen Hong Quang, Nguyen Duong Bo, Nguyen Nhu Dat, Trinh Xuan

Hoang and Duong Xuan Long, Charged Excitons in Bilayer

Quantum Dots Người trình bày: Nguyen Hong Quang

Tran Cong Phong, Huynh Vinh Phuc, Le Thi Thu Phuong, Le Dinh,

Nonlinear Absorption Line‐Widths in Cylindrical Quantum

Wires

Tp. Hồ Chí Minh, 02-06/8/2010

14

Người trình bày: Huynh Vinh Phuc

Nguyen Thanh Tien, Nguyen Huyen Tung, and Doan Nhat Quang,

Electron Scattering from Polarization Charges Bound on a

Rough Interface of Heterostructures Người trình bày: Nguyen Huyen Tung

10h00 – 10h30: Nghỉ giữa buổi


Chủ tọa: Vu Van Hung

Vu Van Hung, Phan Thi Thanh Hong, and Bui van Khue, Boron and

Phosphorus Diffusion in Silicon: Interstitial and Vacancy

Mechanisms Người trình bày: Phan Thi Thanh Hong

Pham DinhTam, Nguyen Quang Hoc, Phung Dinh Phong, and Pham Duy

Tan, Melting of Metals Cu, Ag and Au under Pressure Người trình bày: Pham Dinh Tam

Ho Khac Hieu, Vu Van Hung, and Nguyen Van Hung, Investigation of

the EXAFS Cumulants of Silicon and Germanium

Semiconductors by Statistical Moment Method: Pressure

Dependence Người trình bày: Ho Khac Hieu


15

BUỔI CHIỀU:


Chủ tọa: Nguyen Huyen Tung

Trinh Xuan Hoang, Inferring Amino Acid Interactions in

Proteins using Maximum Entropy Approach Người trình bày: Trinh Xuan Hoang – Báo cáo mời

Nguyen Anh Tuan, Tran Thi Thuy Nu, Nguyen Van Thanh, Vu Van Khai,

Shin-ichi Katayama, Nguyen Huy Sinh, Dam Hieu Chi, Computational

Design of Mn4 Molecules with Strong Intramolecular

Exchange Coupling Người trình bày: Nguyen Anh Tuan

Tran Phuoc Duy and Vo Van Hoang, Atomic Mechanism of

Homogeneous Melting of bcc Fe at Limit of Super‐heating Người trình bày: Tran Phuoc Duy

15h10 – 16h20: Nghỉ giữa buổi và Phần trình bày báo

cáo treo II

Chủ tọa: Le Van Hoang

[P-40] Dao Vong Duc and Huynh Thi Trang Dai, BRST ‐ Invariant

String Functional Interaction Lagrangians Người trình bày: Dao Vong Duc

[P-41] L. T. Hue, H. T. Hung, H. N. Long, V. V. Vien, and V. T. H. Yen,

Renormalization Group and 3‐3‐1 Model with the Discrete

Flavor Symmetries Người trình bày: Ha Thanh Hung

Tp. Hồ Chí Minh, 02-06/8/2010

16

[P-42] Nguyen Suan Han and Le Thi Hai Yen, The Glauber‐type of

Representation for the Scattering Amplitude of the Dirac

Particles on Smooth Potential . Người trình bày: Le Thi Hai Yen

[P-43] Luu Thi Kim Thanh, Tran Thai Hoa, Nguyen Dinh Tuan, Duong Dai

Phuong, The Specific Heat CV of the System of the Q‐

Deformed Harmonic Oscillarors Người trình bày: Luu Thi Kim Thanh

[P-44] Phu Chi Hoa, Vuong Huu Tan, Pham Ngoc Son, Huynh Xuan Lam,

Calculation of Thermal and Epithermal Neutron Self‐

shielding Factors Using the Monte Carlo Code –MCNP Người trình bày: Pham Ngoc Son

[P-45] Tran Thai Hoa, Luu Thi Kim Thanh, Mai Thi Linh Chi, Luong Khanh

Toan, The Applications of Q‐Deformed Statistics in

Phenomenon of Bose‐Einstein Condensation for the Q‐

Deformed Gases Người trình bày: Tran Thai Hoa

[P-46] Vo Van On, Quasars Can just Be White Holes in the

Vector Model for Gravitational Field Người trình bày: Vo Van On

[P-47] Vu Xuan Bach and Nguyen Dinh Dung, Inelastic Scattering of

Polarized Neutrons in Paramagnetic Crystal in Presence of

Radiation and Absorption of Phonon Người trình bày: Vu Xuan Bach

[P-48] Le Dinh, Le Quoc Anh, and Tran Cong Phong, Influence of

Phonon Confinement on Absorption Power and Line‐Width

in a Free‐Standing Gaas Quantum Wire Người trình bày: Le Quoc Anh


17

[P-49] Nguyen Nhu Dat, Frequency‐Dependent Linear and Non‐

Linear Response Properties of Semiconductor Quantum

wires Người trình bày: Nguyen Nhu Dat

[P-50] Le Tuan and Nguyen Thanh Tien, Electron Scattering from

Polarization Charges Bound on a Rough Interface of

Uniformly‐Doped ZnO/Zn1‐xMgxO Heterostructure Người trình bày: Le Tuan

[P-51] Do Phuong Lien and Nguyen Anh Tuan, The Magnetic Casimir

Effect between two Parallel Ferromagnetic Plates Người trình bày: Nguyen Anh Tuan

[P-52] Luong Van Tung, Ngo Thi Thanh Ha, Nguyen Thi Thanh Nhan, Le

Thi Thu Phuong, Nguyen Quang Bau, The Dependence of the

Parametric Transformation Coefficient of Confined Acoustic

and Confined Optical Phonons in the Rectangular Quantum

Wire Người trình bày: Nguyen Thi Thanh Nhan

[P-53] Tran Thi Hai, Nguyen Trung Hong, Nguyen Huyen Tung, Effect

from Doping of Quantum Wells on Enhancement of the

Mobility Limited by One‐Interface Roughness Scattering Người trình bày: Tran Thi Hai

[P-54] Truong Van Tuan and Nguyen Quoc Khanh, Độ Linh Động và

Điện Trở của Khí Điện Tử trong Cấu Trúc Dị Thể

AlGaAs/GaAs ở Nhiệt Độ Khác Không Người trình bày: Truong Van Tuan

[P-55] Vo Thanh Lam, Luong Van Tung, and Tran Cong Phong,

Electrophonon Resonance in Compositional Semiconductor

Superlattices Người trình bày: Vo Thanh Lam

Tp. Hồ Chí Minh, 02-06/8/2010

18

[P-56] Vo Van Tai and Nguyen Quoc Khanh, Độ Linh Động và Điện

Trở của Khí Điện Tử trong Giếng Lượng Tử SiGe/Si/SiGe ở

Nhiệt Độ Khác Không Người trình bày: Vo Van Tai

[P-57] Vu Kim Thai and Hoang Anh Tuan, Two Band Model for

Diluted Magnetic Semiconductors: Study of the

Ferromagnetic Transition Temperature Người trình bày: Vu Kim Thai

[P-58] Vu Van Hung, Dang Thanh Hai and Le Thi Binh, Melting Curve

of Metals: Pressure Dependence Người trình bày: Dang Thanh Hai

[P-59] Nguyen Quang Hoc and Dinh Quang Vinh, Atomic Radii of

Noble Gas Elements in Condensed Phases Người trình bày: Dinh Quang Vinh

[P-60] Nguyen Thu Nhan and Pham Khac Hung, Structural and

Dynamics Properties of Lithium Silicate Người trình bày: Nguyen Thu Nhan

[P-61] Pham DinhTam, Nguyen Quang Hoc, Le Tien Hai, and Pham Duy

Tan, Order – Disorder Phase Transition in Cu3Au under

Pressure Người trình bày: Pham Dinh Tam

[P-62] Vu Van Hung, Le Thi Mai Thanh, and K. Masuda-Jindo, Study of

Elastic Properties of CeO2 by Statistical Moment Method Người trình bày: Vu Van Hung

[P-63] Dinh Xuan Khoa, Pham Quoc Linh, Nguyen Van Thinh, Nguyen Tien

Dung, Le Canh Trung, and Nguyen Huy Bang, Calculation of

Vibrational Intensity Distribution for the 4Pi ‐1Sigma Band

of NaLi Người trình bày: Nguyen Tien Dung


19

[P-64] Nguyen Van Hop, Entanglement Dynamics of Three‐qubit

Chain with Decoherence Người trình bày: Nguyen Van Hop

[P-65] Phan Hoang Chuong, Chuyển động tương đối và chuyển

động Chaos Người trình bày: Phan Hoang Chuong

[P-66] Van Cao Long, Wieslaw Leo ski and Khoa Doan Quoc,

Photoelectron Spectra Induced by Broad‐Band Chaotic Light

from a Structured Sontinuum Người trình bày: Cao Long Van

[P-67] Nguyen Hoang Minh Tri, Vo Phuoc Huy, Dinh Xuan Khoa, Le Van

Doai, Hoang Hong Khue, and Nguyen Huy Bang, Influences of the

Coupling Field on EIT Formation of the Three‐Level Lambda

Configuration of Rb87 Người trình bày: Le Van Doai

[P-68] Le Van Hoang and Nguyen Thanh Son, Generalization of

Dirac and Yang monopoles for 9‐dimensional Space Người trình bày: Le Van Hoang

[P-69] Vy Thi Ha My, Vu Thu Huong, Chu Thuy Anh, To Thi Thao, Ngo Van

Thanh, and Nguyen Ai Viet, On the Information Problem of DNA

in the Denaturation Process Người trình bày: Vy Thi Ha My

[P-70] Phan Thi An Nhan, Pham Hong Phong, and Nguyen Vinh Quang,

Các không gian Sobolev và vấn đề giá trị trung bình của toán

tử vật lý Người trình bày: Phan Thi An Nhan

[P-71] Hui-Min Lin and Chia-Chu Chen, Possibility of Entanglement

Transferal in Uniform Electric Field Người trình bày: Chia-Chu Chen

Tp. Hồ Chí Minh, 02-06/8/2010

20

[P-72] T. D. Thanh, L. V. Nam, D. N. Nghia, and N. H. Cong, Quantum

Interference Effects in Resonance Fluorescence Spectra of a

Four‐Level Atom Damped by a Broadband Squeezed

Vacuum Người trình bày: Thai Doan Thanh

[P-73] Tran Minh Hien and Ho Trung Dung, Local‐Field Correction in

the Strong Atom‐Field Coupling Regime Người trình bày: Tran Minh Hien

[P-74] Vu Ngoc Sau, Doan Hoai Son, Nguyen Van Phu, Nguyen Huy Bang,

Cao Long Van, and Nguyen Minh Hai, Soliton Solutions of Higher‐

order Nonlinear Schrodinger Equation Người trình bày: Vu Ngoc Sau

[P-75] Dinh Nhu Thao and Tran Thien Lan, Efficient 3D Poisson

Solvers based on post‐BICGSTAB Algorithms: BICGSTAB

(L), enhanced BICGSTAB (L) Người trình bày: Tran Thien Lan

[P-76] Phan Duc Anh, Chu Thuy Anh, Ngo Van Thanh, and Nguyen Ai Viet

, The Casimir Interaction between Au and Si in Arbitrary

Configurations Người trình bày: Phan Duc Anh

[P-77] Nguyen Thi Thao, Le Thi Phuong, and Pham Khac Hung, Study of

Size Effect and Thermal Characteristics of Nanoparticles

using Computer Simulation Người trình bày: Nguyen Thi Thao

[P-78] P.K.Hung and T.V.Mung, Computer Simulation of Diffusion

in Disordered Systems with Many Particles Người trình bày: Trinh Van Mung

[P-79] T. L. Thuy. Nguyen, Noel Jakse, and Alain Pasturel , Structure

and Dynamics of Gold‐Silicon Alloy by Molecular Dynamics

Simulation


21

Người trình bày: T. L. Thuy. Nguyen

[P-80] Tran Nguyen Lan and Tran Hoang Hai, Properties of Magnetic

Nano‐Particle Systems: A Monte Carlo Study Người trình bày: Tran Nguyen Lan

[P-81] Tran Thi Thu Hanh and Vo Van Hoang, Structural Properties of

Simulated Liquids and Amorphous GaAs, GaAs2, Ga2As Người trình bày: Tran Thi Thu Hanh

[P-82] V. T. H. Yen, T.T.T Thuy, T.T Thao, N.V Thanh, and N.A Viet , The

Simple Approximate Formula of the Curve of rate Constant

“k” for Medium Temperature Range in the Photosynthetic

Reaction of Bacterial. Người trình bày: Vu Thi Hai Yen

[P-83] Ngo Thi Thu Dinh and Phung Van Dong, Neutrino Masses and

Mixing in Standard Model with A4 ‐ Flavour Symmetry Người trình bày: Ngo Thi Thu Dinh



Nguyen Nhu Dat and Le Thanh Hai, Electron Mobility in a

Semiconductor Quantum Wire Người trình bày: Le Thanh Hai

T.D. Doan, T. Meier, J. Gueder, U. Hoefer, S. W. Kock, Ultra‐fast

Kinetics of Electron at the Metal Surface Người trình bày: Doan Tri Dung

Tp. Hồ Chí Minh, 02-06/8/2010

22

Thứ Tư, ngày 04 tháng 08 năm 2010

Tham quan miệt vườn

Thứ Năm, ngày 05 tháng 08 năm 2010

BUỔI SÁNG:


Chủ tọa: Dao Tien Khoa

Phung Van Dong, Flavor Symmetry and Neutrino Mixing Người trình bày: Phung Van Dong – Báo cáo mời

Nobuchika Okada, Tran Minh Hieu, Discriminating Supersymmetric

Grand Unified Models in Gaugino Mediation Người trình bày: Tran Minh Hieu

D. T. Huong, H. N. Long, and N. T. Thuy, Leptogenesis in

Supersymmetric Economical 3‐3‐1 Model Người trình bày: Hoang Ngoc Long

Tran Huu Phat, Le Viet Hoa, Nguyen Van Long, Nguyen Tuan Anh, and

Nguyen Van Thuan, On a Phase Transitions of Nuclear Matter in

the Nambu‐Jona‐Lasinio Model. Người trình bày: Le Viet Hoa

10h00 – 10h30: Nghỉ giữa buổi


Chủ tọa: Trinh Xuan Hoang

Dao Khac An, Some Theoretical Issues of Wireless High Power

Transmissions and a Mathematical Model of the Wireless


23

Solar Power Transmission Problem from an Orbit in the

Space to the Earth’s Surface. Người trình bày: Dao Khac An

Pham Huu Kien, Pham Khac Hung, and Vu Van Hung, Computer

Simulation of Microscopic Bubbles in Amorphous Alloy

Co81.5B18.5 Người trình bày: Pham Huu Kien

Bui Phuong Thuy and Trinh Xuan Hoang, Evolution of Protein‐

Protein Interaction Networks in Duplication‐Divergence

Model Người trình bày: Bui Phuong Thuy

BUỔI CHIỀU:


Chủ tọa: Nguyen Hong Quang

Dao Tien Khoa, Some Related Topics in Nuclear Physics and

Astrophysics Người trình bày: Dao Tien Khoa – Báo cáo mời

Van-Nam Do, Effects of Metallic Leads and Short‐Range

Scattering Processes on the Electronic Transport Properties of

Graphene in the Charge Neutrality Regime Người trình bày: Van-Nam Do

Dinh Van Tuan and Nguyen Quoc Khanh, Ảnh Hưởng Của Nhiệt Độ

Lên Phổ Plasmon Của Hệ Graphene Hai Lớp Người trình bày: Dinh Van Tuan

Le Thi Thu Phuong, Nguyen Vu Nhan, Nguyen Thuy Linh and Nguyen

Quang Bau, Parametric Resonance of Confined acoustic and

Confined Optical Phonons in the Rectangular Quantum Wire

Tp. Hồ Chí Minh, 02-06/8/2010

24

Người trình bày: Le Thi Thu Phuong

15h45 – 16h30: Tổng kết Hội nghị, Họp Hội Vật lý lý thuyết, Lễ trao giải thưởng Nghiên cứu trẻ năm 2010 của Hội VLLT

16h30 – 17h45: Gặp gỡ Sài Gòn – Sài Gòn xưa và nay


Bao cao vien: PGS. TS. Dang Van Thang (Giam doc bao tang lich su van hoa)

18h00: Liên hoan tổng kết


25

TÓM TẮT BÁO CÁO

Tp. Hồ Chí Minh, 02-06/8/2010

26


(Tp. Hồ Chí Minh, 02 – 06/8/2010)

1. Vật lý năng lượng cao, hạt cơ bản, hạt nhân, thiên văn.

1. Flavor Symmetry and Neutrino Mixing

Phung Van Dong

Institute of Physics, VAST, 10 Dao Tan, Ba Dinh, Ha Noi We give a review of flavor symmetries recently proposed as a leading candidate in solving the tribimaximal neutrino-mixing form. We show how these symmetries work by taking concrete examples: A4 symmetry in the standard model and 331 model.

Báo cáo Mời

2. Some Related Topics in Nuclear Physics and Astrophysics

Dao Tien Khoa

Viện khoa học và kỹ thuật hạt nhân, 179 Hoàng Quốc Việt, Cầu Giấy, Hà Nội A brief overview on nuclear reactions occuring during the stellar evolution is given, focusing on the neutron star formation after a supernova explosion. We present further results obtained in the self-consistent Hartree-Fock (HF) mean-field approach for the bulk nuclear matter (NM) properties, using different sets of the effective nucleon-nucleon interaction. The HF predictions for the NM binding energy and pressure show that the considered mean-field interactions are divided into two families which are associated with two different behaviors (Asy-soft and Asy-stiff) of the NM symmetry energy at high densities, where only the Asy-stiff type interactions comply with the empirical NM pressure. These two families were shown to predict two different behaviors of the proton-to-neutron ratio in the beta-equilibrium which, in turn, imply two drastically different mechanisms for the neutron star cooling. The detailed DWBA analysis of the charge-exchange (p,n) reaction leading to the isobar analog excitation seems to provide some answer to this open question.


27

Báo cáo Mời

3. Neutrinos, Scalars and Dark Energy

Bruce McKellar

Chủ tịch ủy ban Châu Á Liên minh quốc tế các Hội khoa học About 70% of the energy In the Universe is of a form which has negative pressure. The nature of this "dark energy" is unknown, and is the subject of much speculation. I will discuss a model in which neutral fermions, perhaps neutrinos, perhaps super-particles, perhaps other particles, interacting weakly with a light scalar particle, can provide the negative pressure and thus be a candidate for dark energy.

Báo cáo Mời

4. Discriminating Supersymmetric Grand Unified Models in Gaugino Mediation

Nobuchika Okada (1), Tran Minh Hieu (2, 3)

(1) Department of Physics and Astronomy, University of Alabama, Tuscaloosa, AL 35487, USA; (2) Institute of Engineering Physics, Hanoi University of Science and Technology, 1 Dai Co Viet Road, Hanoi, Vietnam; (3) Faculty of Physics, College of Science, Vietnam National University, 334 Nguyen Trai Road, Hanoi, Vietnam It is well-known that SUSY must be broken in a certain way. In order to explain the SUSY breaking mechanism, one introduced the so-called gaugino mediated SUSY breaking (gaugino mediation). However, when the compactification scale is smaller than the GUT scale, the LSP is stau in almost all parameter space. To get the neutralino LSP, the compactification scale should be higher than the GUT scale. We produce mass spectra of gaugino mediation in GUT models consistent with the currently measured value of dark matter relic abundance and Higgs mass bound. Assuming the same LSP mass for both SU(5) and SO(10) GUT models, we find that sizable mass difference appears in left-handed slepton sector, providing a hint to experimentally test which GUT model would be realized in nature.

Báo cáo Miệng

Tp. Hồ Chí Minh, 02-06/8/2010

28

5. On a Phase Transitions of Nuclear Matter in the Nambu-Jona-Lasinio Model.

Tran Huu Phat (1), Le Viet Hoa (2), Nguyen Van Long (3), Nguyen Tuan Anh (4), and Nguyen Van Thuan (5).

(1) Vietnam Atomic Energy Commission, 59 Ly Thuong Kiet, Hanoi, Vietnam. (2) Hanoi University of Education, 136 Xuan Thuy, Cau Giay, Hanoi, Vietnam. (3) Gialai Teacher College, 126 Le Thanh Ton, Pleiku, Gialai, Vietnam. (4) Vietnam Atomic Energy Commission, 59 Ly Thuong Kiet, Hanoi, Vietnam. (5) Hanoi University of Education, 136 Xuan Thuy, Cau Giay, Hanoi, Vietnam. We investigate the stability of nuclear matter in the Nambu-Jona-Lasinio (NJL) model using the Cornwall-Jackiw-Tomboulis (CJT) effective potential which contributes higher loops. In mean field approximation, it was found that the wanted saturation properties are destroyed in the NJL model which is regarded as an extension of the Walecka mean field model to include negative energy fermion states. The minimum of the thermodynamic potential which corresponds to stable nuclear matter in the Walecka.We consider the saturation of the thermodynamic potential formulated by the CJT potential. Our results show that there exist saturation solutions corresponding to the constrain of the couplings.

Báo cáo Miệng

6. Cosmic Formation and Decaying Dark Matter

N. Q. Lan (1) and L. C. Tuong (1)

Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Hanoi, Vietnam The cosmological model with bulk viscosity from late-time dark-matter decay can lead to an improved t to the supernova magnitude-redshift relation, and argue that it is likely satisfy other constraints as well. When the effects of higher-order terms in the transport equation are included in the form for the bulk viscosity coefficient, it possibly better fits to the cosmological data.


29

Báo cáo Miệng

7. Leptogenesis in Supersymmetric Economical 3-3-1 Model

D. T. Huong (1), H. N. Long (2), and N. T. Thuy (3)

Institute of Physics, VAST, 10 Dao Tan, Ba Dinh, Ha Noi We study a leptogenesis via decays of heavy Majorana neutrinos produced non-thermally in inflaton decays in the supersymmetric economical SU(3)_C X SU(3)_L X U(1)_X model with inflationary scenario. For this purpose, neutrino masses in the framework of the mentioned model are considered. At the tree-level, the model contains three Dirac neutrinos: one massless, two large with degenerate masses in the range of the electron mass. At the one-loop level, the left-handed and right-handed neutrinos obtain Majorana masses M_L,R in orders of 10^-2-10^-3 eV and degenerate in M_R=-M_L, while the Dirac masses get a contribution in the range of the tree-level. With the contribution from the inflaton, the masses get a correct hierarchy. The lepton-number violating interaction of the inflaton with right-handed neutrinos exists at the one-loop level, and this is a reason for non-thermal leptogenesis. To satisfy both the gravitino abundance and the cosmological constraint on neutrino mass m_\nu 3 \simeq 0.05 eV, by taking the reheating temperature as low as T_R= 10^6 GeV, we get a limit on the ratio of masses of the light heavies neutrino to those of the inflaton to be: 0.49 \leq M_R1 /M_\phi \leq 0.99.

Báo cáo Miệng

8. Effects of Exotic Shapes on Potential Energy Surface of Superheavy Nuclei

Piotr Rozmej

Faculty of Physics and Astronomy, University of Zielona Gora, Poland In the paper, potential energy surface for many superheavy nuclei was studied in extremely rich space of shapes. Thirteen deformation degrees of freedom was used, including a20, a22, beta3, a32, a40, a42, a44, a50, a52, a54, beta6, beta7 and beta8. The potential energy surface was obtained as function of a20 and a22 deformation with

Tp. Hồ Chí Minh, 02-06/8/2010

30

minimization with respect to all other deformation parameters in every point of a grid. Macroscopic-microscopic method was applied with mean-field in the form of Woods-Saxon potential. Nuclei around magic number N=184, available in fusion channel experiments at Dubna and GSI were studied. Interesting features in some nuclei, like effect of a32 deformation on saddle points, three axial shapes in ground state configuration, possible fission from oblate shape are predicted.

Báo cáo Miệng


31

9. Solutions for Yang-Mills Field with Singular Source Terms and Higher Topological Indices

Nguyen Vien Tho (1), To Ba Ha (2), and Nguyen Quoc Hoan (3)

(1) Hanoi University of Technology, 1 Dai Co Viet, Hai Ba Trung, Ha Noi (2) Le Quy Don University; (3) Specialized School of Ha Giang The screening of color charges in systems of non-Abelian Yang-Mills fields coupled to source terms is a phenomenon of great interest, since it may provide an argument for color confinement in QCD. Some classes of solutions to the Yang-Mills equations with source terms were discovered and investigated. In the present work, we find solutions for Yang-Mills field with two point sources in the sector of higher topological indices. Mathematically, this is a nonlinear problem of elliptic partial differential equations with ï�¤-function singular source terms and axial symmetry. The obtained numerical solution by relaxation methods for field functions is presented. We show that the screening of the source charges is actually present and caused by the vector component of the gauge potential. The total energies of the system are calculted for a range of charge magnitudes, and the plot of energy versus charge magnitude is presented.

Báo cáo Miệng

10. Inelastic Scattering of Polarized Neutrons in Paramagnetic Crystal in Presence of Radiation and Absorption of Phonon

Vu Xuan Bach and Nguyen Dinh Dung

Hanoi University of Science, 334 Nguyen Trai, Thanh Xuan, Ha Noi In this report the effective cross-section of inelastic scattering of polarized neutrons in paramagnetic crystal inpresence of radiation and absorption of phonon is obtained and discussed.

Báo cáo Treo

11. Scattering of Polarized Neutrons in Ferromagnetic Crystal in Presence of Radiation and Absorption of Phonon

Vu Xuan Chung and Nguyen Dinh Dung

Tp. Hồ Chí Minh, 02-06/8/2010

32

Hanoi University of Science, 334 Nguyen Trai, Thanh Xuan, Ha Noi In this report the effective - section of Scattering of polarized neutrons in ferromagnetic crystal in presence of radiation and absorption of phonon is obtained and discussed.

Báo cáo Treo

12. Neutrino Masses and Mixing in Standard Model with A4 - Flavour Symmetry

Ngo Thi Thu Dinh (1) and Phung Van Dong (2)

(1) Hanoi University of Science, 334 Nguyen Trai, Thanh Xuan, Ha Noi, (2) Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Ha Noi Although the Standard Model is very successful, it also leaves many questions unanswered, one of which is massless of neutrinos. In this talk we introduce A4 - flavour symmetry into the Standard Model with appropriate extension of scalar representations. As a result, the neutrinos gain naturely small masses in agreement with experiment. The neutrino mixing matrix in terms of tribimaximal form is obtained.

Báo cáo Treo


33

13. BRST - Invariant String Functional Interaction Lagrangians

Dao Vong Duc (1) and Huynh Thi Trang Dai (2)

(1) Institute of Physics, VAST, 10 Dao Tan, Ba Dinh, Ha Noi

(2) Cantho University, 3/2 Ninh Kieu, Can Tho A simple model is presented for the construction of string field functional interaction Lagrangians. The crucial argument is to introduce some auxiliary funetional and to use appropriate BRST-invariant combinations. The model could also be used to give the change in the mass spectrum of the field components, and as a result to solve the tachyon problem.

Báo cáo Treo

14. The Applications of Q-Deformed Statistics in Phenomenon of Bose-Einstein Condensation for the Q-Deformed Gases

Tran Thai Hoa (1), Luu Thi Kim Thanh(1), Mai Thi Linh Chi (1), Luong Khanh Toan (1).

(1) Hanoi pedagogical university no.2 We consider the statistics of q-oscillators and their applications into the phenomenon of Bose-Einstein condensation. The expression for Bose-Einstein condensations temperature is derived.

Báo cáo Treo

Tp. Hồ Chí Minh, 02-06/8/2010

34

15. Renormalization Group and 3-3-1 Model with the Discrete Flavor Symmetries

L. T. Hue (1), H. T. Hung (2), H. N. Long (1), V. V. Vien (3), and V. T. H. Yen (1)

(2) Hanoi University of Education II, Xuan Hoa, Me Linh, Vinh Phuc (1) Institute of Physics, VAST, 10 Dao Tan, Ba Dinh, Ha Noi (3) Tay Nguyen University We consider the ways of obtaining consistency between the idea of discrete flavour symmetry and an apparent low value of ∝S ~ 0.112 indicated by several low energy experiments. By making a renormalization group analysis we explore the possibility of having the 3-3-1 models with A4 and S4 flavour symmetries as the only intermediate gauge group between the standard model and the scale of unification of the three coupling constants. We shall assume that there is no necessarily a group of grand unification at the scale of convergence of the couplings.

Báo cáo Treo

16. The Higgs Effective Potential in the Electroweak-Scale Right-Handed Neutrinos Model

Pham Quang Hung and Nguyen Nhu Le

Physics department, University of Virginia, USA Physics department, Hue University's College of Education, Viet Nam In quantum field theory, radiative corrections to the Higgs potential can have Higgs effective potential. In the present paper we calculated analytically the Higgs effective potential in the electroweak-scale right-handed neutrinos model. In the calculated progress, the possible contributions to Higgs effective potential were investigated. The results leads to serve bounds on masses of Higgs and fermions in this model.

Báo cáo Treo

17. Generally Covariant Duality and Gravitational Scalar Field

Dao Vong Duc (1) and Nguyen Thi Ha Loan (2)


35

(1) Institute of Physics, VAST, 10 Dao Tan, Ba Dinh, Ha Noi, (2) Hanoi Pedagogical University No.2, Xuan Hoa, Me Linh, Vinh Phuc In this work the concept of Generally covariant duality is considered in the framework of General Relativity Theory based on the tetrad formalism. The generalized covariant Levi- Civita tensor is introduced and the equation for the attached gravitational scalar fields are derived by the use of the tetrad postulate. It is shown that the masses of these fields are closed related to Einstein's Universal Constant, and as a consequence the existence of scalar particle with negative squared mass (like tachyon in String Theory) is also predicted.

Báo cáo Treo

18. Photon-Radion Conversion Cross-Sections in External Electromagnetic Field

P. V. Dong (1), H. N. Long (1), D. V. Soa (2), and N. H. Thao (3)

(1) Institute of Physics, VAST, 10 Dao Tan, Ba Dinh, Ha Noi (2) Department of Physics, Hanoi University of Education, 136 Xuan Thuy, Cau Giay, Ha Noi (3) Department of Physics, Hanoi University of Education II, Xuan Hoa, Me Linh, Vinh Phuc A review of Randall-Sundrum model with stressing on radion phenomenology is presented. The creation of the radion in the external electromagnetic field is considered. The differential cross sections for the conversions in the presence of the electric field of the flat condenser as well as in the magnetic field of the solenoid are calculated in details. The results show that the cross-sections are biggest for the Higgs-radion mixing parameter \xi = + 1/ 6. Based on our results a laboratory experiment for production and detection of the light radions may be described.

Báo cáo Treo

19. The Energy of the Asymmetric Nuclear Matter in the four-Nucleon Model

Tran Huu Phat (1), Nguyen Van Long (2), Nguyen Tuan Anh (3), Le Viet Hoa (4), and Nguyen Chinh Cuong (5)

Tp. Hồ Chí Minh, 02-06/8/2010

36

(1) Vietnam Atomic Energy Commission, 59 Ly Thuong Kiet, Hanoi, Vietnam. (2) Gialai Teacher College, 126 Le Thanh Ton, Pleiku, Gialai, Vietnam. (3) Vietnam Atomic Energy Commission, 59 Ly Thuong Kiet, Hanoi, Vietnam. (4) Hanoi University of Education, 136 Xuan Thuy, Cau Giay, Hanoi, Vietnam. (5) Hanoi University of Education, 136 Xuan Thuy, Cau Giay, Hanoi, Vietnam. The Energy of the asymmetric nuclear matter in the four-nucleon model is determined within the Cornwall-Jackiw-Tomboulis (CJT) effective action approach. In the double-bubble approximation the theory provides the nuclear symmetry energy (NSE) consistent with the recent analysis of experimental data and, at the same time, leads to a softer incompressibility, K0 = 240 MeV, without invoking any additional term similar to the Boguta-Bodmer potential

Báo cáo Treo


37

20. Quasars Can just Be White Holes in the Vector Model for Gravitational Field

Vo Van On

Thu Dau Mot University, 230 Đại lộ Bình Dương, Tỉnh Bình Dương In this paper we prove that quasars can just be while holes in the vector model for gravitational field and thus the controversial properties of quasars as high redshift and extraordinarily high luminosity can be clear.

Báo cáo Treo

21. Calculation of Thermal and Epithermal Neutron Self-shielding Factors Using the Monte Carlo Code –MCNP

Phu Chi Hoa (1), Vuong Huu Tan (2), Pham Ngoc Son (3), Huynh Xuan Lam (1)

(1) The University of Dalat, 01 Phu Dong Thien Vuong, Dalat, (2) Vietnam Atomic Energy Institute, 59 Ly Thuong Kiet, Hanoi, (3) Nuclear Research Institute, 01 Nguyen Tu Luc, Dalat Neutron activation measurement is often performed in a reactor neutron spectrum. When the size of the irradiation sample is not small enough and resonance pecks present in the cross section of the sample nuclide, the thermal and resonance self-shielding effects of neutron flux in the sample must be considered for correction. In this work, the Monte Carlo code MCNP has been applied for calculation of the self-shielding factors for several standard samples and neutron monitors that are often used in neutron activation measurements. The results of calculation are tabulated with different sample thickness in comparison with experimental and calculated values from the literature.

Báo cáo Treo

22. The Specific Heat CV of the System of the Q- Deformed Harmonic Oscillarors

Luu Thi Kim Thanh (1), Tran Thai Hoa (1), Nguyen Dinh Tuan (1), Duong Dai Phuong (2)

Tp. Hồ Chí Minh, 02-06/8/2010

38

(1) Hanoi pedagogical university no.2, Xuan Hoa, Me Linh, Vinh Phuc (2) Miliary College of Tank- Armour Officer We investigate some physical content of the q- deformed harmonic oscillator, with q is real and q is a phase factor. The expression for the statistical sum and the average energy of one q- deformed harmonic oscillator are derived, we have caculated the specific heat Cv of the once mol of the q- deformed harmonic oscillator.

Báo cáo Treo

23. Inelastic Scattering of Polarized Neutrons in Magnetic Helicoidal Structure Crystal in Presence of Radiation and Absorption of Phonon

Le Phuong Thao and Nguyen Dinh Dung

Hanoi University of Science, 334 Nguyen Trai, Thanh Xuan, Ha Noi In this report the effective cross- section of inelastic scattering of polarized neutrons in magnetic helicoidal structure crystal in presence of radiation and absorption of phonon is obtained and discussed

Báo cáo Treo

24. Impact of CP Phases on the Gluino Production Process in Electron- Positron Annihilation

Trieu Quynh Trang (1), Nguyen Thi Thu Huong (2), and Ha Huy Bang (3)

(1) Nam Dinh teacher's tranning college (2,3) Ha Noi University of Science, 334 Nguyen Trai, Thanh Xuan, Ha Noi The gluino pair production process in electron- positron annihilation into gluino pair has been considered within the Minimal Supersymetric Standard Model (MSSM) with CP phases. In this work, we have annalyzed effecs if finite CP phases on gluino pair- production in e +e- collisions at future high energy linear collider. And we find that, the cross- section can be observed over most ranges of MSSM parameter space.

Báo cáo Treo


39

25. The Glauber-type of Representation for the Scattering Amplitude of the Dirac Particles on Smooth Potential .

Nguyen Suan Han (1) and Le Thi Hai Yen (1)

(1) Vietnam National University, Hanoi University of Sciences, Faculty of Physics, Department of Theoretical Physics By the functional integration method the deduction of the Glauber-type representation for scattering amplitude of the spin Â½ particles on the smooth potential is performed. This method generalizing the usual operation of taking the square of the Dirac equation is proposed for obtaining the functional integral representation of the amplitude. It has shown that the scattering amplititudes, which have obtained by moving to shell mass, of normal Green function and quadratic Green function are the same types, and taking into account of spin of particles leads to new term which is responsible for the spin flip in the scattering processes.

Báo cáo Treo

Tp. Hồ Chí Minh, 02-06/8/2010

40

II. Vật lý các môi trường đông đặc, hệ thấp chiều, cấu trúc nano

26. Condensation Kinetics of Polaritons in Semiconductor Microcavities

Cao Huy Thien, Doan Tri Dung, and Tran Thoai Duy Bao

Viện Vật lý, Thành phố Hồ Chí Minh, Số 1 Mạc Đĩnh Chi, Thủ Đức, Tp. Hồ Chí Minh The excited polaritons relax by phonon and polariton – polariton scattering to the ground state. At sufficiently low temperatures and sufficiently strong pumping a condensation in the ground state occurs which is directly observable in terms of an onset of laser action of the lowest photon mode of the cavity. Our recent theoretical studies for a finite-size Bose Einstein condensation of polaritons are reviewed.

Báo cáo Mời

27. Frequency-Dependent Linear and non-linear Response Properties of Semiconductor Quantum wires

Nguyen Nhu Dat

Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Ha Noi Linear and non-linear optical response of semiconductor quantum wires is studied. The influence of the confinement potential on the optical properties of the wire is computed.

Báo cáo Treo


41

28. Effects of Metallic Leads and Short-Range Scattering Processes on the Electronic Transport Properties of Graphene in the Charge Neutrality Regime

Van-Nam Do

Hanoi Advanced School of Science and Technology (HAST), Hanoi University of Science and Technology (HUST), No 01 Dai Co Viet Road, Hanoi, Vietnam Since the discovery of graphene in 2004 the electronic transport properties of this two-dimensional carbon material in the charge neutrality regime is still an issue attracting a great consideration. It is due to the fact that according to the cone shape of the electronic structure, the density of state must be vanished at the Dirac point but both experimental and theoretical studies show a finite minimum value of the charge conductivity at this point. The non-zero minimum conductivity has been interpreted as due to the transport of charges via the evanescent modes and/or due to the long-range scattering caused by charged impurities absorbing on the graphene surface. In this presentation, we however point out that both the metallic leads used in the transport measurement and the short-range scattering processes play an essential role in governing the quantitative picture of the conductivity comparable to available experimental data.

Báo cáo Miệng

29. Ultra-fast Kinetics of Electron at the Metal Surface

T.D. Doan (1), T. Meier (2), J. Gueder (2), U. Hoefer (2), S. W. Kock (2)

(1) Ho Chi Minh City Institute of Physics, 1 Mac Dinh Chi, Ho Chi Minh City, Vietnam. (2) Fachbereich Physik und Zentrum fuer Materialwissenschaften, Philipps-Universitaet, D-35032 Marburg, Germany. An electron in the valence band under a two-frequencies field pumping will jump into the vacuum and be trapped in the image-potential states causing by its image charge locating nearly inside the metal surface. Their band structure shows a similar to a two band system to be likely semiconductors. Their kinetics, thus, will

Tp. Hồ Chí Minh, 02-06/8/2010

42

be studied by using the Bloch equations to be similar to the semiconductors. A calculated electric current due to asymmetry population is shown a good agreement with corresponding one measured recently given by Guedder et al.

Báo cáo Miệng

30. Nonlinear Absorption Line-Widths in Cylindrical Quantum wires

Tran Cong Phong (1), Huynh Vinh Phuc (2), Le Thi Thu Phuong (1), Le Dinh (1)

(1) Department of Physics, Hue University’s College of Education, 32 Le Loi, Hue; (2) Department of Physics, Dong Thap University, 783 Pham Huu Lau, Cao Lanh, Dong Thap, Viet Nam Applying the theory of nonlinear optical conductivity for an electron-phonon system that has appeared recently, we propose a new way to obtain the line-width for nonlinear optical conductivity in a system of electron-optical phonon in cylindrical quantum wires (CQW). General analytic expressions for the nonlinear absorption power (NLAP) are obtained in the presence of an intensity field and the two photon process is included into the result. In the first time, the graphic dependence of NAP on the photon energy and the shape of CQW is achieved computationally for specific CQWs. From graphs of the NLAP we obtain line-widths as profile of curves. The dependence of the line-width on the temperature and the parameter of a CQW is reasonable in comparison with some theoretical and experimental results.

Báo cáo Miệng

31. Parametric Resonance of Confined Acoustic and Confined Optical Phonons in the Rectangular Quantum Wire

Le Thi Thu Phuong, Nguyen Vu Nhan, Nguyen Thuy Linh, and Nguyen Quang Bau

Hanoi University of Science , 334- Nguyen Trai, Hanoi, Viet Nam The parametric resonance of confined acoustic and confined optical phonons in the rectangular quantum wire in the presence of an external electromagnetic field is theoretically predicted by using a


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set of quantum transport equations for phonons. The threshold amplitude of the field for parametric amplification of the confined acoustic phonons is obtained. The dependence of the threshold amplitude of the field on the temperature T and on the wave number q is numerically evaluated, plotted and discussed for a specific quantum wire GaAs/GaAsAl. All the results are compared with those for the unconfined phonons to show the difference

Báo cáo Miệng

32. Charged Excitons in Bilayer Quantum Dots

Nguyen Hong Quang, Nguyen Duong Bo, Nguyen Nhu Dat, Trinh Xuan Hoang, and Duong Xuan Long

Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Ha Noi The excitons and charged excitons in bilayer two-dimensional parabolic quantum dots with spatially separate electrons and a hole are investigated theoretically by unrestricted Hartree-Fock method. The effect of external magnetic fields, confinement, and additional charging electrons on the energies of excitons are studied numerically in details in the dependence of the separation length d between two layers. The absorption spectra of charged excitons are simulated and compared in two cases with d=0 and d<>0 showing the interesting role of the separation length between two layers in the optical properties of the system.

Báo cáo Miệng

33. Ảnh hưởng của nhiệt độ lên phổ Plasmon của hệ Graphene hai lớp

Dinh Van Tuan and Nguyen Quoc Khanh

Bộ Môn Vật Lý Lý Thuyết, Khoa Vât Lý – Vật Lý Kỹ Thuật, Trường Đại Học Khoa Học Tự Nhiên TP. Hồ Chí Minh, 227-Nguyễn Văn Cừ, Quận 5, Thành Phố Hồ Chí Minh , Việt Nam Trong báo cáo này, chúng tôi trình bày hàm điện môi động ở nhiệt độ bất kì của hệ graphene hai lớp kích thích (doped double-layer graphene (DLG)), một hệ được tạo thành từ hai đơn lớp graphene với mật độ hạt tải tương ứng n1, n2 và khoảng cách hai lớp là d. Kết

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quả này được dùng để tìm phổ phân cực plasmon của hệ ở nhiệt độ bất kì. Chúng tôi đã khảo sát các trường hợp: hệ đối xứng (n1= n2), hệ bất đối xứng và đặc biệt là n2=0 và thu được nhiều kết quả thú vị. Đồng thời chúng tôi củng khảo sát sự thay đổi của phổ plasmon của hệ theo nhiệt độ, và theo khoảng cách d giữa hai lớp.

Báo cáo Miệng

34. Electron Scattering from Polarization Charges Bound on a Rough Interface of Heterostructures

Nguyen Thanh Tien (1), Nguyen Huyen Tung (2), and Doan Nhat Quang(3)

(1) College of Science, Can Tho University, 3-2 Road, Can Tho City, Vietnam (2) Institute of Engineering Physics, Hanoi Universityof Technology, 1 Dai Co Viet Road, Hanoi, Vietnam (3) Center for Theoretical Physics, Vietnamese Academy of Science and Technology, 10 Dao Tan Street, Hanoi, Vietnam We present the theory of an ad hoc scattering mechanism for electrons in the conduction channel of actual heterostructure (HSs) made of polar materials, e.g., nitrides and oxides. We show that the carriers must be extra scattered from spontaneous and piezoelectric polarization charges bound on a rough interface of the HS. In combination with the normal surface roughness (SR) scattering from roughness-induced fluctuations in the potential barrier position, this gives rise to an effective surface roughness scattering referred to as the polarization surface roughness (PSR) scattering. This process is determined by the roughness profile and polarizability of the interface.

Báo cáo Miệng

35. Effects of Magnetic Field on the Electronic Structure and Transport Properties of Graphene and Graphene Nanoribbons

Le Hoang Anh (1), Ho Sy Ta (2), and Do Van Nam (3)

(1) Center for Training of Excellent Students, Hanoi University of Science and Technology, No 01 Dai Co Viet Road, Hanoi, Vietnam; (2) Department of Physics, National University of Civil Engineering, No 55 Giai Phong Road, Hanoi, Vietnam;


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(3) Hanoi Advanced School of Science and Technology, Hanoi University of Science and Technology, Building F No 40 Ta Quang Buu Street, Hanoi, Vietnam We present a study of the effects of a magnetic field on the electronic structure and transport properties of graphene and graphene nanoribbons with two typical edge shapes, namely the zigzag and the armchair. In our calculations an empirical tight-binding description in the nearest neighbor coupling approximation is used to describe the graphene nanoribbons. The magnetic field is included by using the conventional Peierls substitution which leads to a phase factor for the hoping parameter between two lattice nodes. The dependence of the energy on the wave vector along the ribbons length or the dissipation law is then calculated just by diagonalizing a Hamiltonian. However, the transport properties of these systems are investigated by using the non-equilibrium Green’s function (NEGF) method. Obtained results show that the magnetic field almost does not cause any significant effects for narrow graphene nanoribbons, but for the larger one (>30 nm) it can significantly quantize the electronic states of graphene and graphene nanoribbons into discrete modes known as the Landau levels. This quantization is clearly seen in the pictures of the density of states and/or the transmission coefficient.

Báo cáo Treo

36. Influence of Phonon Confinement on Absorption Power and Line-Width in a Free-Standing Gaas Quantum Wire

Le Dinh (1), Le Quoc Anh (1) and Tran Cong Phong (1,2)

(1) Departmant of Physcis, Hue University's College of Education, 32 Le Loi, Hue, Viet nam. (2) National Education Union of Vietnam, 02 Trinh Hoai Duc, Dong Da, Ha noi, Viet Nam Based on state-independent projection technique (SIPT) we calculate analytical expressions of conductivity tensor and absorption power in cylindrical quantum wires (CQW) due to electron-longitudinal optical (LO) phonon interaction. Both electrons and phonons are confined in the CQW and the numerical results are presented for free-standing GaAs quantum wires. From graphs of the absorption power we obtain line-widths as profile of curves. The dependence of the absorption power and the line-widths

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on the temperature, the radius of the CQW are obtained. Comparisons between the value of the absorption powers and the line-widths in the case of confined phonons and bulk phonons are discussed.

Báo cáo Treo


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37. Simple Model for the Indirect Exciton in a Strong Magnetic Field

V.T Hoa, T.T.T. Van, T.T. Thao, P.D. Anh, N.V. Thanh, and N.A. Viet

Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Ha Noi A simple theoretical model for the indirect exciton (type 2) without and in strong magnetic field is developed, in which the electrons and hole are separated in two spaces. The stabilize role of a strong magnetic field is investigated. For comparison the case of exciton type 2 in InP/GaAs quantum dot was studied and found a good agreement between theoretical and experimental data.

Báo cáo Treo

38. Conductance and Shot Noise in Gate-Controlled Zigzag Graphene Nanoribbons

Tran Nguyen Dung

Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Ha Noi Using the recursive Green’s function method, we study the ballistic transport in gated controlled zigzag graphene nanoribbons. The conductance, the current-voltage characteristics, and the shot noise have been calculated for ribbons with different widths under a tuning gate. We observed a step-like structure and an oscillation behavior of the conductance as a function of the incident energy. The shot noise value obtained demonstrates the ballistic nature of the conduction process.

Báo cáo Treo

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39. Electron Mobility in a Semiconductor Quantum Wire

Nguyen Nhu Dat (1) and Le Thanh Hai (2)

(1) Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Ha Noi; (2) Hanoi University of Civil Engineering A macroscopic continuum model is used to study the longitudinal optical phonons in a circular semiconductor quantum wire which is embeded in a finite thickness barrier. The Hamiltonian describing the electron-LO-phonon interaction is obtained and used to calculate the phonon-limited electron mobility by the memory function approach. Numerical calculations are performed for a typical GaAs/GaAlAs quantum wire to demonstrate the effect of the barrier thickness on the electron mobility.

Báo cáo Mieng

40. Effect from Doping of Quantum - Wells on Enhancement of The Mobility Limited by One-Interface Roughness Scattering

Tran Thi Hai (1), Nguyen Trung Hong (2), Nguyen Huyen Tung( 3)

(1) Department of Physic, Hanoi National University, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam (2) Center for Talent Training, Hanoi University of Technology, 1 Dai Co Viet Road, Hanoi, Vietnam (3) Institute of Engineering Physics, Hanoi University of Technology, 1 Dai Co Viet Road, Hanoi, Vietnam We present a theoretical study of the effect from doping of quantum wells (QW) on enhancement of the mobility limited by one-interface roughness scattering. We find that for roughness-related scattering from two interfaces or from the doping-side interface, the mobility in a two-side (2S)-doped QW are larger than that in one-side (1S)-doped, but smaller than that in undoped counterparts. For scattering from substrate-side interface, the 2S-doped QW mobility is smaller than the 1S-doped QW one. We examine the dependence of the 2S-doped QW mobility on the well width, carrier density, and


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correlation length. The roughness-limited mobility of 2D-doped QWs exhibits a well-width evolution deviated from the classic law for the undoped QW. Compared to the 1S-doping case, the 2S-doped QW mobility is enhanced by a rather large factor dependent on the sample parameters. Our theory is able to well reproduce the recent experimental data on transport in 2S-doped square QWs, e.g., the mobility dependence on the well width and the enhancement factor, which have not been explained so far.

Báo cáo Treo

41. Parametric Transformation and Parametric Resonance of Confined Acoustic Phonons and Confined Optical Phonons in Quantum Wells

Do Manh Hung, Nguyen Quang Bau, and Nguyen Dinh Nam

Hanoi University of Science, 334 Nguyen Trai, Thanh Xuan, Ha Noi The parametric transformation and parametric resonance of confined acoustic phonons and confined optical phonons in quantum wells in the presence of an external electromagnetic field are theoretically studied by using a set of quantum kinetic equations for phonons. The analytic expression of the parametric transformation coefficient K1 and the threshold amplitude of the field in quantum wells are obtained. Unlike the case of unconfined phonons, the formula of K1 and contains a quantum number m characterizing confined phonons. Their dependence on the temperature T of the system and the frequency of the electromagnetic field is studied. Numerical computations have been performed for GaAs/AlAsAl quantum wells. The result have been compared with the case of unconfined phonons which show that confined phonons cause some unusual effects.

Báo cáo Treo

42. Electrophonon Resonance in Compositional Semiconductor Superlattices

Vo Thanh Lam (1), Luong Van Tung (2), and Tran Cong Phong (3)

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(1) Department of Natural Sciences, Sai Gon University, 273 An Duong Vuong, District 5, Ho Chi Minh, Viet Nam. (2) Department of Physics, Dong Thap University, 783 Pham Huu Lau, Cao Lanh, Dong Thap, Viet Nam. (3) Department of Physics, Hue University’s College of Education, 32 Le Loi, Hue,Viet Nam The electrophonon resonances (EPR) and optical detected electrophonon resonance (ODEPR) effects in compositional semiconductor superlattices (CSSL) are investigated by using the quantum kinetic equation for electrons in the case of electron – longitudinal optical (LO) phonon scattering. General analytic expressions for the absorption power are obtained. We also obtain the photon energy dependence of optical detected electrophonon resonance condition for a specific GaAs-Ga1-xAlxAs superlattice (x = 0.15). In particular, anomalous behaviors of the ODEPR effect such as the splitting of ODEPR peaks for incident photon energy are discussed. This raises a possibility of detecting experimentally electric subbands in CSSLs by utilizing EPR effects

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43. Ginzburg – Landau Functional for the Coexistence of many Phases in many – Body Systems

Nguyen Tri Lan

Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Ha Noi A generalized version of Hatree – Fock – Bogoliubov approximation, which plays an essential role in the investigation of coexistence of many phases in many – body systems, is obtained within the functional multi – component Hubbard – Stratonovich transformation. The BCS gap equation and magnetization equation containing the contributions of different order parameters are obtained straightforward from Hatree – Fock – Bogoliubov approximation resulting in a possible for the coexistence of many phases. In the vicinity of the phase transition, the perturbative expansion of effective action around the mean – field solution in the auxiliary fields reveals a lot information about the phase transition of the system that is described by Ginzburg – Landau functional of order parameters. The stationary conditions of the grand thermodynamic potential with respect to decoupling parameters of Hubbard – Stratonovich transformation is also studied to ensure the consistence of physical quantities of interests or in the other words, the cancellation of between different diagram families generated by Hubbard – Stratonovich transformation.

Báo cáo Treo

44. Electron Mobility in an Unintentionally Doped GaN/AlGaN Surface Quantum Well

Nguyen Viet Minh

Institute of Engineering Physics, Hanoi University of Science and Technology, 1 Dai Co Viet Road, Hanoi We present a theoretical study the two-dimensional electron gas 2DEG at low tempera-ture in an un-intentionally doped GaN/AlGaN surface quantum well, taking adequate ac-count the possible scattering mechansms. Within model of surface quantum wells that 2DEG be described by the extended Fang-Howard wave

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function, we are able to derive an analytic expression for the self-consistent Hartree potential. Then, we obtained an expresion describing the enhancement of the 2DEG screening and unscreened potentials for different scattering sources. We studied the electron mobility due to different scattering sources in an unintentionally doped GaN/AlGaN surface quantum well.

Báo cáo Treo

45. Supersolids of Hard Core - Bosons on a Triangular Lattice.

Pham Thi Thanh Nga (1) and Nguyen Toan Thang (2)

(1) Water Resources University (2) Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Ha Noi We study the boson model on a triangular lattice interacting only via on-site hardcore repulsion by mapping to a system of spins (S=1/2). We investigate the supersolid phase of the systems which is a state matter displaying both diagonal long- range (solid) order as well as off-diagonal long-range (superfluidity) by utilizing a semionic representation for the spin-XXZ model. We obtain the phase diagrams exhibiting a coexistence of superfluid and solid orders as the parameters are varied.

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46. The Nonlinear Acoustoelectric Effect in a Cylindrical Quantum Wire with a Infinite Potential

Nguyen Van Nghia (1), Tran Thi Thu Huong (2), Nguyen Quang Bau (2)

(1) Department of physics, Water Resources University, 175 Tay Son, Dong Da, Ha Noi (2) Department of physics, Hanoi National University, 334 Nguyen Trai, Thanh Xuan, Ha Noi The nonlinear acoustoelectric effect in a cylindrical quantum wire with a infinite potential is investigated by using Boltzmann kinetic equation for an acoustic wave whose wavelength λ = 2π/q is smaller than the mean free path l of the electrons and hypersound in the region ql >> 1, (where q is the acoustic wave number). The analytic expression for the acoustoelectric current I is calculated in the case: relaxation time of momentum is constant approximation and degenerates electrons gas. The nonlinear dependence of the expression for the acoustoelectric current I on the acoustic wave numbers q and on the intensity of constant electric field E are obtained. Numerical computations are performed for AlGaAs/GaAs cylindrical quantum wire with a infinite potential. The results are compared with the normal bulk semiconductors and the superlattices to show the values of the acoustoelectric current I in the cylindrical quantum wire are different than they are in the normal bulk semiconductors and the superlattices.

Báo cáo Treo

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47. The Dependence of the Parametric Transformation Coefficient of Confined Acoustic and Confined Optical Phonons in the Rectangular Quantum Wire

Luong Van Tung (1), Ngo Thi Thanh Ha (2), Nguyen Thi Thanh Nhan (2), Le Thi Thu Phuong (2), Nguyen Quang Bau (2)

(1) Department of Physics, Dong Thap University, 783-Pham Huu Lau, Dong Thap, Viet Nam (2) Hanoi University of Science, 334 Nguyen Trai, Thanh Xuan, Ha Noi The parametric transformation of confined acoustic and confined optical phonons in a rectangular quantum wire is theoretically studied by using a set of quantum kinetic equations for phonons. The analytic expression of parametric transformation coefficient of confined acoustic and confined optical phonons in a rectangular quantum wire is obtained. The dependence of the parametric transformation coefficient on the temperature T is numerically evaluated, plotted and discussed for a specific quantum wire GaAs/GaAsAl. All the results are compared with those for the unconfined phonons to show the difference.

Báo cáo Treo

48. Rate of Phonon Excitation and Conditions for Phonon Generation in Cylindrical Quantum Wires

Tran Cong Phong (1,2), Le Thi Thu Phuong (1), Tran Dinh Hien (1)

(1) Department of Physics, Hue University's College of Education, 32 Le Loi, Hue, Vietnam; (2) National Education Union of Vietnam, 02 Trinh Hoai Duc, Dong Da, Ha noi, Vietnam Phonon generation via the Cerenkov effect in cylindrical quantum wires (CQW) is theoretically studied based on the quantum kinetic equation for phonon population operator. Both electrons and phonons are confined in the CQW. Analytical expressions for the rate of change of the phonon population and conditions for phonon generation are obtained. Numerical results for GaAs/AlAs cylindrical quantum wires show that the amplitude of the laser field


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must satisfy additional conditions that are different in comparison with those of the other works. The differences between the generation of acoustic phonon and longitudinal optical phonon are considered. Comparisons between two cases of confined phonons and bulk phonons are discussed.

Báo cáo Treo

49. Độ linh động và điện trở của khí điện tử trong giếng lượng tử SiGe/Si/SiGe ở nhiệt độ khác không

Vo Van Tai and Nguyen Quoc Khanh

Trường Đại học KHTN TP HCM, 227 Nguyễn Văn Cừ, Quận 5, TP Hồ Chí Minh Chúng tôi đã tính độ linh động và điện trở của khí điện tử giả hai chiều trong giếng lượng tử Si ở nhiệt độ khác không cho cả hai trường hợp có hoặc không có từ trường song song. Mật độ hạt, bề dày lớp và nhiệt độ được chọn sao cho tán xạ tạp chất và bề mặt nhám là các cơ chế chủ yếu. Các kết quả của chúng tôi có dáng điệu phù hợp với các kết quả thực nghiệm. Chúng tôi chỉ ra rằng đối với từ trường quanh giá trị bão hòa điện trở hầu như không phụ thuộc nhiệt độ.

Báo cáo Treo

50. Two Band Model for Diluted Magnetic Semiconductors: Study of the Ferromagnetic Transition Temperature

Vu Kim Thai and Hoang Anh Tuan

Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Ha Noi The ferromagnetic transition temperature (Tc) of a two band model for diluted magnetic semiconductors (DMS) is calculated by using the coherent potential approximation (CPA). It is shown that Tc is strongly parameter dependent such as density of the carriers, magnetic coupling constants, and the hopping terms. The maximal Tc of the two band model is found when both impurity bands fully overlap and this value is approximately twice larger than the highest Tc obtained in the single band model.

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51. Density Functional Based Tight Binding Study on Wurzite Core-shell Nanowires Heterostructures ZnO/ZnS.

N.T. Thuong, N.V. Minh, N.N. Tuan, V.N. Tuoc

Hanoi University of Technology, 1 Dai Co Viet, Hai Ba Trung, Ha Noi We present a Density Functional Based Tight Binding study on the structural and electronic structure of II-VI wurtzite core-shell, core- multi-shell ZnO/ZnS hexagonal unsaturated nanowires of circular and hexagonal cross section shapes and examine the dependence of interface stress and formation energy on nanowire lateral size with diameter range from 20Å upto 40Å. Wire’s Young’s modulus along the axial growth direction have been estimated. Also the tensile test have been applied for various wires to show the diameter dependence’s of their mechanical properties. The electronic properties of these heterostructure nanowire (e.g. Projected Band Structure, Density of State, charge transfer via Mulliken population analysis) also exhibit wire’s diameter dependence behaviors.

Báo cáo Treo

52. Electron Scattering from Polarization Charges Bound on a Rough Interface of Uniformly-Doped ZnO/Zn1‐xMgxO Heterostructure

Le Tuan (1) and Nguyen Thanh Tien (2)

(1) Institute of Engineering Physics, Hanoi University of Science and Technology, 1 Dai Co Viet Road, Hanoi, Vietnam (2) College of Science, Can Tho University, 3-2 Road, Can Tho City, Vietnam We present a theory of polarization surface roughness (PSR) scattering mechanism for electrons in the conduction channel of actual ZnO/Zn1-xMgxO heterostructures of the both O- and Zn-polar faces in ZnO layer. In combination with the normal surface roughness (SR) scattering from roughness-induced fluctuations in the potential barrier position, the carriers must be extra scattered from the polarization charges bound on a rough interface of the heterostructure. This ad hoc scattering mechanism tends to reduce carrier mobility down to a half of value in comparison with the one


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due to SR counterpart. The different doping levels in the barrier and channel regions of heterostructures remarkably affect on background impurity, alloy disorder and SR/PSR scattering rates and lead to correction to the value of carrier mobility, which has not been considered so far.

Báo cáo Treo

53. The Magnetic Casimir Effect between two Parallel Ferromagnetic Plates

Do Phuong Lien (1) and Nguyen Anh Tuan (2)

(1) Institute of Engineering Physics (IEP), Hanoi University of Technology (HUT) (2) International Training Institute for Materials Science (ITIMS), Hanoi University of Technology (HUT) In this work, we study theoretically the long-range magnetic interaction between two parallel ferromagnetic plates, which arises from the magnetic Casimir effect. The behavior of the interaction is discussed for two configurations when the magnetization is perpendicular or parallel to the plates. The dependence of the Casimir force and Casimir energy on different interplate distances D has been investigated. Results of numerical calculations for a concrete system have been also presented.

Báo cáo Treo

54. Độ linh động và điện trở của khí điện tử trong cấu trúc dị thể AlGaAs/GaAs ở nhiệt độ khác không

Truong Van Tuan and Nguyen Quoc Khanh

(1) Trường sĩ quan kỹ thuật quân sự, 189 Nguyễn Oanh, Quận Gò vấp, TP Hồ Chí Minh; (2) Trường Đại học KHTN TP HCM, 227 Nguyễn Văn Cừ, Quận 5, TP Hồ Chí Minh Sử dụng phương trình Boltzmann bán cổ điển chúng tôi đã tính độ linh động và điện trở của khí điện tử giả hai chiều trong cấu trúc dị thể AlGaAs/GaAs ở nhiệt độ khác không cho cả hai trường hợp có hoặc không có từ trường song song. Chúng tôi xét trường hợp khi tán xạ tạp chất và bề mặt nhám là các cơ chế tán xạ chủ yếu. Các kết

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quả của chúng tôi qui về kết quả của các tác giả khác nhận được trước đây khi không có từ trường hoặc nhiệt độ bằng không. Chúng tôi chỉ ra rằng sự phụ thuộc nhiệt độ của hàm điện môi ảnh hưởng đáng kể lên sự phụ thuộc nhiệt độ của điện trở.

Báo cáo Treo


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III. Vật lý thống kê, tinh thể, kim loại, hợp kim.

55. Investigation of the EXAFS Cumulants of Silicon and Germanium Semiconductors by Statistical Moment Method: Pressure Dependence

Ho Khac Hieu (1), Vu Van Hung (2), and Nguyen Van Hung (3)

(1) National University of Civil Engineering, 55 Giai Phong Street, Hanoi, Vietnam; (2) Hanoi National University of Education, 134 Xuan Thuy Street, Hanoi, Vietnam; (3) University of Science,VNU Hanoi, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam Using the statistical moment method (SMM), the pressure dependence of EXAFS cumulants of silicon and germanium have been investigated. The analytical expressions of the first and second cumulants of silicon and germanium have been derived. The agreements of our calculations with other theoretical results and experimental data support for our new theory in investigating the pressure dependences of EXAFS cumulants of semiconductors. Futhermore, the equation of state of silicon and germanium semiconductors have been obtained. The lattice parameters and the change of volume under hydrostatic pressure P of these semiconductors also have been estimated.

Báo cáo Miệng

56. Boron and Phosphorus Diffusion in Silicon: Interstitial and Vacancy Mechanisms

Vu Van Hung (1), Phan Thi Thanh Hong (2), and Bui Van Khue (3)

(1) Hanoi National University of Education, 136 Xuan Thuy street, Cau Giay, Hanoi, Vietnam 2) Hanoi Pedagogices University No 2, Xuan Hoa, Me Linh, Vinh Phuc (3) Hai Phong University, 171 Phan Dang Luu, Kien An, Hai Phong The diffusion of boron B and phosphorus P in silicon has been investigated by using statistical moment method (SMM). Temperature dependence of activation energy and diffusion coefficient of B and P in silicon obey interstitial and vacancy mechanisms has been studied. the effects of anharmonicity and the

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different mechanisms on diffusion of b and P in silicon are calculated. Experimental results for B and P diffusion in silicon and SMM calculations of the activation energy for B and P diffusion by interstitial mechanism are in quantitave agreement.

Báo cáo Miệng

57. Melting of Metals Cu, Ag and Au under Pressure

Pham Dinh Tam (1), Nguyen Quang Hoc (2), Phung Dinh Phong (3), and Pham Duy Tan (1)

(1) Le Quy Don University of Technology, 100 Hoang Quoc Viet, Cau Giay, Hanoi (2) Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Hanoi (3) Hanoi University of Education No.2, Me Linh, Hanoi The dependence of the melting temperature of metals Cu, Ag and Au on pressure in the interval from 0 to 40 kbar is studied by the statistical moment method. This dependence has the form of near linearity and the calculated slope of melting curve is 3.9 for Cu, 5.8 for Ag and 6.1 for Au. These results are in good agreement with the experimental data

Báo cáo Miệng

58. Specific Heat at Constant Volume for Molecular Cryocrystals of Nitrogen Type

Nguyen Quang Hoc (1) and Tran Quoc Dat (2) (1) Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Hanoi (2) Tay Nguyen University, 456 Le Duan, Buon Me Thuot City Specifics heats at constant volume of molecular cryocrystals of N2 type are studied by combining the statistical moment method and the self-consistent field method taking account of lattice vibrations and molecular rotational motion. Theoretical results are applied to molecular cryocrystals of N2 type such as N2, CO, N2O and CO2 cryocrystals and numerical results are compared with the experimental data.

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59. Melting Curve of Metals: Pressure Dependence

Vu Van Hung (1), Dang Thanh Hai (2), and Le Thi Binh (1)

(1) Hanoi National University of Education, 136 Xuanthuy, Caugiay, Hanoi (2) Vietnam Education Publishing House, Tran Hung Dao, Hai Ba Trung, Ha Noi The high-pressure melting curve of metals has been studied using the statistical moment method. The melting was investigated at different high pressures, the melting temperature being in good agreement with previous experiments and several theoretical calculations. A small slope for the melting dT/dP curve of metals is estimated and a possible explanation for this behaviour is given. Finally, a P -V - T equation of states is obtained, the temperature and pressure dependences of the shear modulus and the bulk modulus being estimated.

Báo cáo Treo

60. Investigation of Thermodynamic Properties Liquid Cu – Ni Alloys Using Moment Method

Nguyen Thanh Hai

Institute of Engineering Physics, Hanoi University of Technology, 1 Dai Co Viet, Hai Ba Trung, Ha Noi Using the model of liquid alloys having structural similar solid alloys at melting temperature, the expressions nearest-neighbour distance of liquid alloy are obtained. The change in volume, entropy, specific heat of alloys on melting at the pressure P=0 is investigated. Our obtain results are applied to numerical calculations

Báo cáo Treo

61. Study of Thermodynamic Properties of Zirconium under High Pressure

Vu Van Hung, Le Dinh Hong, and Nguyen Thu Ha

Hanoi University of Education 136 Xuan Thuy, Cau Giay, Ha Noi The moment method in statistical (SMM) dynamics is used to study the thermodynamic quantities of zirconium taking into account the anharmonicity effects of the lattice vibrations and hydrostatic

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pressures. The thermodynamic quantities of zirconium are calculated as a function of the pressure. The SMM calculations are performed by using the Lennard-Jones potential for the zirconium crystal with hcp and bcc structures. Numerical results for lattice parameter, thermal expansion coefficient, specific heats at constant volume and those at the constant pressure CV and CP of zirconium crystal with bcc and hcp structures are found to be in good agreement with experiment.

Báo cáo Treo

62. Study of Elastic Properties of CeO2 by Statistical Moment Method

Vu Van Hung (1), Le Thi Mai Thanh(1), and K. Masuda-Jindo (2)

(1)Hanoi National University of Education, 136 Xuan Thuy, Hanoi, Vietnam (2) Department of Material Science and Engineering, Tokyo Institute of Technology, Nagasuta, Midori-ku, Yokohama 226-8530, Japan The purpose of the present article is to investigate the temperature and pressure dependences of the elastic properties of cerium dioxide using the statistical moment method (SMM). The equation of states of bulk CeO2 is derived from the Helmholtz free energy, and the pressure dependences of the elastic moduli like the bulk modulus, BT, shear modulus, G, Young’s modulus, E, and elastic constants (C11, C12 and C44) are presented taking into account the anharmonicity effects of the thermal lattice vibrations. In the present study, the influence of temperature and pressure on the elastic moduli and elastic constants of CeO2 have also been studied, using three different interatomic potentials.. We compare the results of the present calculations with those of the previous theoretial calculations as well as with the available experiments

Báo cáo Treo

63. Structural and Dynamics Properties of Lithium Silicate

Nguyen Thu Nhan and Pham Khac Hung

Department of Computational Physics, Hanoi University of Science and Technology, Vietnam


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The diffusion mechanism in silicate melts is a long debated topic in material science. The present paper focuses on to give new insight in this problem based on the comparative study for pure and lithium silicate melts (SiO2 and (Li2O)0.1.(SiO2)0.9). Both silicate models consisting of 3000 atoms have been prepared at ambient pressure and temperature from 1500 to 4000 K. The simulation reveals a significant difference in the tetrahedral-network structures which results in the change in the diffusion mechanism of silicon and oxygen. The local structure of both melts is also analyzed and discussed here.

Báo cáo Treo

64. Order – Disorder Phase Transition in Cu3Au under Pressure

Pham Dinh Tam (1), Nguyen Quang Hoc (2), Le Tien Hai (1), and Pham Duy Tan (1)

(1) Le Quy Don University of Technology, 100 Hoang Quoc Viet, Cau Giay, Hanoi (2) Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Hanoi The dependence of the critical temperature Tc for alloy Cu3Au on pressure in the interval from 0 to 30 kbar is studied by the statistical moment method. The calculated velocity of critical temperature changing to pressure is 2.1K/ kbar in the interval from 7 to 21 kbar and this result is in a good agreement with the experimental data.

Báo cáo Treo

65. Study of Elastic Properties of Quantum Crystals by Statistical Moment Method

Vu Van Hung, Hoang Van Thai, and Dinh Quang Vinh

Hanoi National University of Education, 136 Xuan Thuy, Hanoi, Vietnam Temperature and pressure dependences of the elastic properties of quantum crystals have been studied using the analytic statistical moment method (SMM). The equation of states of the quantum crystals is derived from the Helmholtz free energy, and the pressure dependences of the elastic moduli like the bulk modulus, BT, shear modulus, G, Young’s modulus, E, and elastic constants (C11, C12

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and C44) are presented taking into account the anharmonicity effects of the thermal lattice vibrations. In the present study, the influence of temperature and pressure on the elastic moduli and elastic constants of Ar, Kr, and Xe have also been studied, using the Lennard-Jones potentials and we compare the SMM results with those of the previous theoretial calculations as well as with the available experimental results.

Báo cáo Treo

66. A Thermodynamic Lattice Theory on Lindemann’s Melting Temperature and Eutectic Point of FCC Binary Alloys

Nguyen Van Hung, Nguyen Cong Toan, Tong Sy Tien, Nguyen Bao Trung

Department of Physics, University of Science, VNU-Hanoi. 334 Nguyen Trai, Thanh Xuan, Hanoi A thermodynamic lattice theory has been developed for determination of the melting curves and eutectic points of fcc binary alloys. Based on Lindemann’s criterion the analytical expressions for the ratio of root mean square fluctuation in atomic positions on the equilibrium lattice positions and the nearest neighbor distance, and then from which those for the melting curves of binary alloys composed by fcc constituent elements have been derived. This melting curve provides information on Lindemann’s melting temperatures of binary alloys with respect to any proportion of constituent elements and on their eutectic points. Numerical results for some fcc binary alloys provide a good correspondence between the calculated and experimental phase diagrams, where the calculated results for Cu1-xNix agree well with the measured values.

Báo cáo Treo

67. Atomic Radii of Noble Gas Elements in Condensed Phases

Nguyen Quang Hoc and Dinh Quang Vinh

Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Hanoi Neutral atomic radii of dissolved noble gas elements in condensed phases are obtained by treating the neutral atoms as “ions” of zero


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oxidation state and by interpolating from a plot of radius vs. oxidation state for isoelectronic ions. The major assumption is that the radius of an ion or a neutral atom having an electronic configuration of noble gas elements depends primarily on the interaction between the nucleus and the surrounding electrons and not on the interaction between the ion and its neighbours. As expected, the values of the new set of radii are slightly greater than the univalent radii and smaller than the radii of noble atoms in their crystals in which the coordination number is 12

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IV. Vật lý lượng tử, quang lượng tử, thông tin lượng tử

68. Engineered Spin Chains for Perfect Quantum State Transfer

Nguyen Van Hieu and Nguyen Bich Ha

Max-Planck Institute for the Physics of Complex Systems, Dresden, Germany and Institute of Materials Science, Vietnam Academy of Science and Technology For the application to the quantum information processing technology the quantum state transfer (QST) between two directly interacting qubits as well as between two distant ones interacting through the intermediary of different quantum systems were widely considered. As the intermediary system it was proposed to use that of photons in an optical fiber for the case of the QST between two quantum dots placed inside two microcavities connected through this optical fiber [1-4], or a network of interacting spins in the case of the QST between two spin-qubits interacting with this network [5-10]. It is known that the perfect QST from one end of a homogeneous N-qubit chain to another is possible only for N = 2 and 3. In order to achieve the perfect QST it was proposed to use engineered spin chains with untunable but modulated coupling between adjacent spins, and a special version of engineered spin chains allowing the perfect QST was found in literature. The purpose of this work is to establish a wide class of engineered inhomogeneous mirror-symmetric N-spin chains with modulated untunable couplings which can provide the perfect QST between two ends of each chain. It includes as special cases the spin chains previously proposed. The sufficient conditions for the engineered mirror-symmetric spin chains allowing the perfect QST are derived. From these conditions the algebraic equations determining physical parameters of these spin chains are established. By solving these equations we can obtain the sets of values of these physical parameters. Examples of the chains with even and odd numbers of spins are presented. References [1] Cirac J I, Zoller P, Kimble H J and Mabuchi H 1997 Phys. Rev. Lett. 78 3221 [2] Pellizzari T 1997 Phys. Rev. Lett. 79 5242 [3] Serafini A, Mancini S and Bose S 2006 Phys. Rev. Lett. 96 010503 [4] Nguyen Van Hieu, Nguyen Bich Ha and Duong Hai Trieu 2010 Adv. Nat. Sci.: Nanosci. Nanotechnol. 1 015001 [5] Lloyd S 2003 Phys.


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Rev. Lett. 90 167902 [6] Bose S 2003 Phys. Rev. Lett. 91 207901 [7] Christandl M, Datta N Ekert A and Landahl A J 2004 Phys. Rev. Lett. 92 187902 [8] Albanese C, Christandl M, Data N and Ekert A 2004 Phys. Rev. Lett. 93 230502 [9] Karbach P and Stolze J 2005 Phys. Rev. A 72 030301 [10] Nguyen Van Hieu 2009 J. Phys.: Condens. Matt. 21 273201

Báo cáo Mời

69. Detecting Entanglement with non-Hermitian Operators

Ho Trung Dung

Ho Chi Minh city Institute of Physics, 1 Mac Dinh Chi Str., District 1, Ho Chi Minh city, Vietnam We derive several entanglement conditions employing non-hermitian operators. We start with two conditions that were derived previously for field mode operators, and use them to derive conditions that can be used to show the existence of field-atom entanglement and entanglement between groups of atoms. The original conditions can be strengthened by making them invariant under certain sets of local unitary transformations, such as Gaussian operations. We then apply these conditions to several examples, such as the Dicke model. Further, we present conditions that allow us to determine whether blocks of spins are entangled. We show that sometimes these conditions can detect entanglement better than conditions involving individual spins. We apply these conditions to study entanglement in spin wave states, both when there are only a few magnons present and also at finite temperature.

Báo cáo Miệng

70. Construction of Potential Energy Curves for Diatomic Molecules by the Inverted Perturbation Approach.

Dinh Xuan Khoa(1), Nguyen Tien Dung(1), Pham Van Trong(2), and Nguyen Huy Bang(1)

(1)Vinh University, 182 Le Duan Street, Vinh City, Vietnam; (2) Hong Duc University, Thanh Hoa, Vietnam. Knowing of potential energy curves (PEC) of diatomic molecules plays important role in atomic and molecular physics because it can provide information for prediction of atomic colissions, chemical bondings, and dispersion forces. Construction of PECs from

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experimental data therefore attracts great attention of spectroscopists. There are revelral ways to archieve this goal. Perhaps the simplest one is to fit the data to the simple Morse function in which only two adjustable parameters to be determined. More adjustable parameters can be introduced to get more flexible form of PEC, but however for modern accurate spectroscopic measurements such models are not sufficient enough for interpretation of overal data. Up-to-date, the most efficient method for construction of a PEC which is satisfy a given accurate demand is the Inverted Perturbation Approach (IPA). The method was proposed by Kosman et al [1] and Vidal et al [2] and then developed by Pashov et al [3] as a fully quantum mechanical method for searching an accurate potential energy curve of a diatomic molecular state. In this paper we present the IPA method and discuss its aspects for construction of PEC of diatomic molecules. The method is then applied to the 4Pi state of NaLi molecule. Here, the previous PEC which was determined numerically by the semi-classical Rydberg-Klein-Rees method reported in the previous work [4] is employed as a trial function in the IPA procedure to search an optimum potential energy. The final IPA potential confirms results determined by recent theoretical ab initio calculations [5]. References [1] W. Kosman et al., J. Mol. Spectrosc. 56 (1975) 93. [2] C. Vidal et al., J. Mol. Spectrosc. 65 (1977) 46. [3] A. Pashov et al., Comput. Phys. Commun 128 (2000) 622. [4] Nguyen Huy Bang et al., Chem. Phys. Lett, 440 (2007) 199. [5] N. Mabrouk et al., J. Phys. B: At. Mol. Opt.Phys. 41 (2008) 155101.

Báo cáo Miệng

71. Distributuion of the Laser Intensity and the Force acting on Dielectric Nano-Particle in the 3D-Optical Trap using Counter-propagating Pulsed Laser Beams

Ho Quang Quy (1), Bui Sy Khiem (2), Nguyen Thi Ha Trang (3), Chu Van Lanh (3)

(1) Academy of Military Science & Technology, Hoang Quoc Viet, Cau Giay, Ha Noi (2) Second High Secondary School of Tinhgia, Thanhhoa (3) University of Vinh, Le Duan, Vinh, Nghe An


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In this article the 3D-optical trap using counter-propagating laser beams is proposed. The expressions described the space-distribution of laser total intensity, and related optical forces acting on the dielectric nano-particle are derived. Some simulated results are presented and discussed.

Báo cáo Miệng

72. Operator Method for Exactly Solving Schrodinger Equation for Atoms

Nguyen Phuong Duy Anh (1), Cao Ho Thanh Xuan (2), Nguyen Van Hoa (3), Le Van Hoang (3)

(1) Thu Dau Mot University, 6 Tran Van On, Phu Hoa, Thu Dau Mot City, Binh Duong Province (2) Southern Agriculture College,Tan My Chanh, My tho City, Tien Giang Province (3) Ho Chi Minh City University of Pedagogy, 280 An Duong Vuong, Dist. 5, Ho Chi Minh City We show that the operator method (OM) using the Laplace transformation can be effectively applied to solve the Schrodinger equation for atoms. Detailed calculations performed on the hydrogen atom demonstrate convergence of perturbation series. Moreover, we can use the free parameter to regulate the rate of convergence. The basis set (the wave-function of a harmonic oscillator) in the form of annihilation and creation operators is very convenient to calculate the matrix elements using purely algebraic method applicable to other atoms. This result is the first step in an effort to apply non-perturbation method such as OM for atomic systems.

Báo cáo Treo

73. The Casimir Interaction between Au and Si in Arbitrary Configurations

Phan Duc Anh, Chu Thuy Anh, Ngo Van Thanh, and Nguyen Ai Viet

Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Ha Noi

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The Casimir force between Au and Si bodies is computed in different configurations by basing on Lifshitz theory with describing a dielectric for metal and semiconductor by means of plasma model and Drude model, respectively. The most precise experiments between a large Au sphere and Si plate demonstrate that in comparison with the experimental Casimir force, the theoretical calculation has from 0.5% to 7% error. The graphs offered in this paper opens predictions for measurement in the future.

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74. Construction of Potential Energy Curve for the 3Pi State of NaLi

Nguyen Tien Dung, Dinh Xuan Khoa, Vu Ngoc Sau, Nguyen Thanh Vinh, Tran Manh Cuong, and Nguyen Huy Bang

Vinh University, 182 Le Duan Street, Vinh City, Vietnam. This paper presents construction of an accurate potential energy curve (PEC) for the 3Pi state of NaLi molecule by means of the Inverted Perturbation Approach (IPA). The previous PEC which was determined numerically in the framework of semi-classical Rydberg-Klein-Rees (RKR) method reported in the previous work [5] is used as a trial function in the IPA procedure to search an optimum potential energy. The optimum PEC (refered as IPA PEC) reproduces 380 observed spectral lines of the 3Pi←1Sigma band of NaLi with a dimesionless standard deviation 0.67. It is determined numerically in a grid of 0.1Çº in the region ranging from 2.5 to 5.0 Çº of internuclear distance, which coveres the overal experimental data. The obtained PEC can used to compare with recent ab initio calculations in [6,7]. References [1] W. Kosman, J. Hinze, J. Mol. Spectrosc. 56 (1975) 93. [2] C. Vidal, H. Scheingraber, J. Mol. Spectrosc. 65 (1977) 46. [3] A. Pashov et al., Comput. Phys. Commun 128 (2000) 622-634. [4] G. Herzberg, Molecular Spectra and Molecular Structure I. Spectra of Diatomic Molecules (Van Nostrand, Princeton, 1955). [5] Nguyen Huy Bang et al., Chem. Phys. Lett, 440 (2007) 199-202 [6] I. D. Petsalakis et al., J. Chem. Phys., 129, 054306 (2008) [7] N. Mabrouk et al., J. Phys. B: At. Mol. Opt.Phys. 41 (2008) 155101 (15pp) .

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75. Possibility of Entanglement Transferal in Uniform Electric Field

Hui-Min Lin and Chia-Chu Chen

National Cheng-Kung University, Physics Department, 1 University Road, Tainan, Taiwan By using the Rashba Hamiltonian, the evolution of spin entanglement of two spin-1/2 particles in a homogeneous electric field is investigated. It is shown that Bell states become disentangle within finite time and there exist un-entangled spin states which stay un-entangled during evolution. The correlations among spin-spin, momentum-momentum and spin-momentum entanglements are discussed in detail. Moreover, a state is constructed to illustrate the fact that spin-momentum entanglement is solely a dynamical effect which can arise without any entanglement of the other degree of freedom. The results are also extended to the mixed states where Werner states are treated.

Báo cáo Treo

76. Chuyển động tương đối và chuyển động Chaos

Phan Hoang Chuong

Trường Đại Học Công Nghệ Thông Tin, Đại Học Quốc Gia Tp. Hồ Chí Minh, Kp6 Phường Linh Trung, Thủ Đức, Hồ Chí Minh Như trong chuyển động Brown các hạt chuyển động ziczac phức tạp mà sau là hình ảnh đặc trưng của chuyển động nhiệt phân tử. Trong chuyển động nhiệt, ngoài chuyển độ ziczac hỗn loạn còn có các dao động như vậy trong chuyển động Brown cũng có dao động. Ngoài những dao động nhiệt do năng lượng hấp thu từ photon nhiệt còn có những dao động biểu kiến do quan sát từ hệ ngoài. Theo quan điểm chuyển động tương đối, hệ ngoài xem như hệ thống đứng yên, hệ chuyển động gắn với hạt chuyển động với vận tốc ngẫu nhiên. Từ phép biến đổi Lorentz ta có thể nhận được biểu thức của dao động biểu kiến nếu dựa vào các đặc tính của chuyển động Chaos.

Báo cáo Treo

77. Phương trình Schrodinger và phương trình truyền nhiệt Chaos

Phan Hoang Chuong


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Trường Đại Học Công Nghệ Thông Tin, Đại Học Quốc Gia Tp. Hồ Chí Minh, Kp6 Phường Linh Trung, Thủ Đức, Hồ Chí Minh Phương trình Schrodinger là phương trình mô tả chuyển động của các hạt vi mô dưới dạng các hàm sóng, mặc dù không có dạng của phương trình sóng thông thường trong vật lý toán (không chứa đạo hàm cấp hai của thời gian). Mặt khác các hạt vi mô còn có tính hạt, tức là chuyển động thành dòng hạt. Từ đặc tính của chuyển động chaos ta có thể đưa phương trình Schrodinger về dạng phương trình truyền nhiệt thông thường với các biến Wiener. Từ đây có thể thấy các hạt chuyển động tựa dòng nhiệt và ta có thể thu được nghiệm phương trình mô tả hạt với thế đóng vai trò nguồn nhiệt.

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78. Influences of the Coupling Field on EIT Formation of the Three-level Lambda Configuration of Rb87

Nguyen Hoang Minh Tri (1), Vo Phuoc Huy (2), Dinh Xuan Khoa (3), Le Van Doai (3), Hoang Hong Khue (3), and Nguyen Huy Bang (3)

(1) Faculty of Physics, Dong Thap University, 783 Pham Huu Lau Str., Dong Thap City, Vietnam; (2) Faculty of pedagogy, Bac Lieu University, 108 Vo Thi Sau Str., Bac Lieu Town, Vietnam; (3)Faculty of Physics, Vinh University, 182 Le Duan Str., Vinh city. In this work we investigate electromagnetically induced transparency (EIT) properties of cold Rb87 atom formed by two laser beams, a strong coupling beam and a weak probe beam, via the three-level lambda excitation scheme. The response of the atom for the probe beam under the excitation of the coupling beam is represented by using density matrix formalism within the electric dipole and rotating wave approximations. In the regime of weak strength of the probe laser field, the matrix element which corresponds to the probe transition is derived analytically. We then consider influences frequency detuning and intensity of the coupling field on the absorption and dispersion coefficients on of the coupling laser field. References [1] S.E. Harris, J.E. Field, A. Imamoglu, Phys. Rev. Lett. 64 (1990) 1107.

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[2] K.J. Boller, A. Imamoglu, S.E. Harris, Phys. Rev. Lett. 66 (1991) 2593. [3] B.S.Ham, J. Mod. Opt. 49 (2002) 2477. [4] L.V. Hau, S. E. Harris, Z, Dutton, C.H. Bejroozi, Nature 397 (1999) 594. [5] M.D. Eisaman, A. Andre, F. Massou, M. Fleischhauer, A.S. Zibrov, M.D. Lukin, Nature 438 (2005) 837. [6] D.A. Braje, V. Balic, S. Goda, G.Y. Yin, S.E. Harris, Phys.Rev. Lett. 93 (2004) 183601. [7] H. Lee, M. Fleischhauer, M.O. Scully, Phys. Rev. A58 (1998) 2587. [8]. Yong-qing Li and Min Xiao, Phys. Rev. A51 (1995) R2703-2706. [9] J. Gea-Banacloche, Yong-quing Li, Shao-zheng Jin, and Min Xiao, Phys. Rev A51 (1995) 576. [10] Cohen Tannoudji: Manipulating atoms with photons, Nobel lecture in Physics, 1997.

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79. Calculation of Vibrational Intensity Distribution for the 4Pi -1Sigma Band of NaLi

Dinh Xuan Khoa (1), Pham Quoc Linh (2), Nguyen Van Thinh (3), Nguyen Tien Dung (1), Le Canh Trung (1), and Nguyen Huy Bang (1) (1)Vinh University, 182 Le Duan Street, Vinh City, Vietnam; (2) Ca Mau ethnic boarding senior high school, Ca Mau City, Vietnam; (3) Bac Lieu University, 108 Vo Thi Sau Str., Bac Lieu Town, Vietnam. Within the Born-Oppenheimer approximation a molecular state is represented by the so-called radial Schrödinger dinger equation. By solving this equation one can obtain level energies together vibrational wave functions for the molecule. The calculated wave functions are then used perform the integration followed the Franck-Condon principle giving pattern of vibrational intensity distribution. In this paper we present our numerical calculation of vibrational intensity distribution for the 4Pi-1Sigma band of NaLi molecule by using Franck-Condon principle. We also determine internuclear distances at which spectral intensity is extreme. The calculated


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pattern of spectra is compared to recent experimental observations. We discuss deviations between the calculated and experimental results.

Báo cáo Treo

80. On the Molecular Constants of Diatomic Molecules

Nguyen Tien Dung (1), Nguyen Van Thinh (2), Le Canh Trung (1), Dinh Xuan Khoa (1), and Nguyen Huy Bang (1)

(1) Faculty of Physics, Vinh University, 182 Le Duan Str., Vinh City, Vietnam; (2) Faculty of pedagogy, Bac Lieu University, 108 Vo Thi Sau Str., Bac Lieu Town, Vietnam. In this paper we present a brief theory of molecular constants and a procedure of linear least-squares method for determination of molecular constants for diatomic molecules. We propose three criteria for getting number of constants. The criteria are then used to determine molecular constants for 4Pi state of NaLi based on 420 spectral lines. We test consistency of the determined constants by using Kratzer relations. Having the molecular constants, we estimate dissociation energy of the 4Pi state and then compare to experimental one. We will discuss nature of deviation between our calculated and the experimental values of the dissociation energy.

Báo cáo Treo

81. Local-Field Correction in the Strong Atom - Field Coupling Regime

Tran Minh Hien and Ho Trung Dung

Ho Chi Minh city Institute of Physics, 1 Mac Dinh Chi Str., District 1, Ho Chi Minh city The problem of local-field correction is typically studied in conjunction with the problem of spontaneous decay of an excited guest atom embedded in a bulk medium, with the atom-field interaction being in the weak-coupling regime. We consider an atom enclosed within a microsphere coated by dielectric layers with alternating high and low refractive index. The Bragg's reflections ensure that the strong atom-field coupling can occur. By taking

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advantage of the real-cavity model and the fact that the Green tensor of concentric spheres is known in closed form, we study the effects of the local-field correction on the system dynamics, including the vacuum Rabi frequency.

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82. Generalization of Dirac and Yang monopoles for 9 -Dimensional Space

Le Van Hoang and Nguyen Thanh Son

Department of Theoretical Physics, Ho Chi Minh City University of Pedagogy, 280 An Duong Vuong, Dist. 5, Ho Chi Minh City Using the generalized Hurwitz transformation we found an equivalence between a 16-dimensional harmonic oscillator and a 9-dimensional hydrogen-like atom in the SO(8) gauge field. Based on this finding, we propose a method for establishing a monopole in a 9-dimensional space which is indeed a generalization of Dirac monopole (1931) for 3-dimensional space as well as of Yang monopole (1978) for 5-dimensional space.

Báo cáo Treo

83. Entanglement Dynamics of Three-qubit Chain with Decoherence

Nguyen Van Hop

Faculty of Physics, Hanoi University of Education, 136 Xuan Thuy, Cau Giay, Ha Noi Abstract. We study quantum dynamics of three-qubit chain with decoherence, this work is devoted to a general theoretical study of this system with the decoherence caused by its interactions with the environment. The whole system of rate equations is separated into different subsystems. All approximative solutions of the system is derived and their explicit expressions are presented. The obtained results apply to studying entanglement of three-qubit system initially prepared in GHZ and W states and transmitted through the phase flip channels, amplitude damping as well as the dephase and amplitude damping. With the help of the lower bound for three-qubit concurrence we show that W state preserves more entanglement than GHZ state in transmission through the phase flip


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channels, amplitude damping as well as the dephase and amplitude damping.

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84. Tracking the Keto-Enol Tautomerism Process of DNA Base by Ultra-Short Laser Pulses using High Harmonic Generation

Hoang Van Hung, Le Hai My Ngan, Le Thi Cam Tu, Nguyen Ngoc Ty, Le Van Hoang

Department of Theoretical Physics, Ho Chi Minh City University of Pedagogy, 280 An Duong Vuong, Dist. 5, Ho Chi Minh City Using the molecular dynamics method within Born-Oppenheimer approximation implemented in the GAUSSIAN, we simulate the keto-enol tautomerism process of thymine, one of the four bases of the DNA molecule. By analyzing the high-order harmonic spectra emitted from thymine while interacting with ultra-short laser pulses during the chemical reaction path of the tautomerism, we identify the intensity peaks nearby the stable states (keto and enol) as well as transition state. This finding might be a useful tool for tracking the DNA tautomerism, the reason of gene mutation.

Báo cáo Treo

85. The two-Mode Squeezed Pair Coherent States and Their Non-Classical Properties

Truong Minh Duc and Nguyen Thi Nguyet

Physics Department, Hue University of Pedagogy, 32 Le Loi street, Hue city Tel: 0912056566 E-mail:[email protected] In this paper, we study the non-classical properties of the two-mode squeezed pair coherent states such as squeezing, entanglement and antibunching. We show that these states exhibit fully the two-mode squeezing, the two-mode entanglement and the two-mode antibunching. The difference properties of these states and the pair coherent states were given more detail in the conclusion.

Báo cáo Treo

86. Các không gian Sobolev và vấn đề giá trị trung bình của toán tử vật lý

Phan Thi An Nhan (1), Pham Hong Phong (2), and Nguyen Vinh Quang (3)


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(1) Đại học Cần Thơ, 3/2 Ninh Kiều, Cần Thơ (2) Viện Vật lý, Hà Nội, 10 Đào Tấn, Ba Đình, Hà Nội Dùng các không gian Sobolev để mô tả miền xác định của các toán tử Vật lý.Nhờ đó làm rõ nguyên nhân của hiện tượng:các giá trị trung bình của nhiều toán tử Vật Lý tại trạng thái cơ bản của Nguyên tử Hydrogen bằng vô cùng.

Báo cáo Treo

87. Các không gian Sobolev và vấn đề các tích phân chuyển động

Nguyen Chanh Qui (1), Pham Hong Phong (2), and Nguyen Vinh Quang (2)

(1) Đại học Cần Thơ, Đường 3/2 Quận Ninh Kiều, Cần Thơ (2) Viện Vật lý, Hà Nội, 10 Đào Tấn, Ba Đình, Hà Nội Dùng các không gian Sobolev để mô tả miền xác định của các toán tử Vật lý. Dẫn ra hệ thức mới(khác điều vẫn được trình bày trong các sách từ trước tới nay)để mô tả điều kiện cần và đủ để một toán tử là tích phân chuyển động.

Báo cáo Treo

88. Soliton Solutions of Higher-order Nonlinear Schrodinger Equation

Vu Ngoc Sau (1), Doan Hoai Son (2), Nguyen Van Phu (2), Nguyen Huy Bang (2), and Cao Long Van (3), Nguyen Minh Hai (3)

(1)Faculty of Technology, Vinh University, Vietnam; (2) Faculty of Physics, Vinh University, Vietnam; (3) Faculty of Physics and Astronomy, University of Zielona Gora, Poland; (4) Thanh Binh 1 High School, Dong Thap Province, Vietnam. Propagation of femto-second or subfemto-second optical pulses in single mode fibers is of interest in optical communication because of its potential for high data rate transmission systems, specially when shapes of envelope of the pulses remains constants (solitons). In such short time regime, evolution of envelope of the pulses is described by the so called generalized Schrödinger equation (GNSE) which takes into account nonlinear effect as self phase

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modulation (SPM), group velocity dispersion (GVD), third order dispersion (TOD), self-stepening (SS) and stimulated Raman scattering (SRS). In this paper we search soliton solutions for the GNSE in the presence of all above nonlinear effects by use of Jacobian expansion. We see in several cases that even when SRS effects taken into account, e.g. all above nonlinear effects are considered simultaneously, soliton solutions can be derived. REFERENCES [1] Hasegawa, A., Tappert, F.D.: Appl. Phys. Lett. 23, 142 (1973) [2] Mollenauer, L.F., Stolen, R.H., Gordon, J.P.: Phys. Rev. Lett. 45, 1095 (1980) [3] Konar, S., Sengupta, A.: J. Opt. Soc. Am. B 11, 1644 (1994). [4] Kumar, A., Kurz, T., Lauterbon, W.: Phys. Lett. A 235, 367 (1997) [5] Konar, S., Jana, S.: Opt. Commun. 236, 7 (2004) [6] Konar, S., Sen, P.K., Kumar, J.: J. Nonlinear Opt. Phys. Mater. 8, 492 (1999) [7] Zhou, C., He, X.T., Chen, S.: Phys. Rev. A 46, 2277 (1992) [8] Artigas, D., Torner, L., Torres, J.P., Akhmediev, N.: Opt. Commun. 143, 322 (1997) [9] Jana, S., Konar, S.: Phys. Lett. A 362, 435 (2007) [10] Radhakrishnan, R., Kundu, A., Lakshmanan, M.: Phys. Rev. E 60, 3314 (1999) [11] Anderson, D.: Phys. Rev. A 27, 3135 (1983) [12] Malomed, B.A.: Prog. Opt. 43, 71 (2003) [13] Handbook of Mathematical Functions, Abramowitz and Stegun (ed), NewYork: Dover 1965.

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89. Optical Bistable Effect of Two-Port Nonlinear Fiber Mach-Zehnder Interferometer

Ho Quang Quy (1), Vu Ngoc Sau (2), Nguyen Van Hoa (3), Nguyen Thi Thanh Tam (4).

(1) Academy of Military Science and Technology; (2) Faculty of Physics, Vinh University; (3) Faculty of Technology, HongDuc University; (4) Faculty of Nature, QuangNam University.


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In this article, we propose a two-port nonlinear fiber Mach-Zehnder interferometer (NFM-ZI). Based on the resolution of the equations of waves propagating in the two-port NFM-ZI, the expressions describing the relation between output and input intensities are found out. The dependence of the bistable character of the output-input intensity relation on initial phase shift, nonlinear refractive index and length of optical fiber is surveyed and discussed. The results confirm bistable character of the two-port NFM-ZI and its operation as the optical bistable device. The results of this work play an important role in designing the two-port NFM-ZI in the future.

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90. Quantum Interference Effects in Resonance Fluorescence Spectra of a Four-Level Atom Damped by a Broadband Squeezed Vacuum

T. D. Thanh (1), L. V. Nam (2), D. N. Nghia (1) and N. H. Cong (2)

(1) Ho Chi Minh City University of Food Industry, 140 Le Trong Tan Street, Tay Thanh Ward, Tan Phu District, Ho Chi Minh City (2) Electric Power University In this paper we analyze the steady-state populutions and resonance fluorescence spectrum (RFS) of a four-level atom consisting of three close by spaced upper levels decaying to a common lower level. The atom is driven by strong coherent field and a single broadband squeezed vacuum. We consider the interplay between the quantum interference and the squeezed field between the three possible decay channels. High population inversion and extremely narrow emission lines are obtained with moderate Rabi frequencies, which are a direct consequence of decay-induced interferences. The RFS for a degenerate excited exhibits a high narrowing of the non-degenerated, we found that the the sqeezed field breaks the trappy condition attained when induced interreference is maximal.

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91. Higher-order Properties of Two-Mode Photon-added Displaced Squeezed States

Truong Minh Duc and Ngo Thi Thuy Trang

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Physics Department, Hue University of Pedagogy, 32 Le Loi street, Hue city Tel: 0912056566 E-mail:[email protected] We study the higher-order squeezing, the entanglement and the antibunching in two-mode photon-added displaced squeezed states. We obtain analytic forms of the degree of the higher-order squeezing, the entanglement and the antibunching. We show that these states exhibit all the higher-order squeezing, the entanglement and also have the antibunching behaviors. However, the higher-order antibunching may or may not exist depending on the parameters of these states.

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92. Dynamic Chemical Imaging of Molecule N2 by Tomographic Method using High Harmonic Generation - Theoretical Analysis of Quality Improvement.

Nguyen Ngoc Ty and Le Van Hoang

Ho Chi Minh University of Pedagogy, Physics Department 280 An Duong Vuong St, Dist. 5, Ho Chi Minh City By theoretical simulation, we confirm the recent experimental results published by S. Heassler et al. [Nature Physics 6, 200 (2010)] about dynamical imaging the highest occupied molecular orbital (HOMO) and the lower-lying orbital (referred to as HOMO-1) of molecule N2 using high harmonic generation (HHG). The `experimental’ HHG data used are simulated by theoretical calculation within the strong field approximation using Lewenstein model with considering the partial distribution of molecular orientation. We also analyze the affection of the plateau region limitation on the quality of imaging. We show that the quality of tomographic method is much better if the laser of wave length 1200nm is used instead of 800nm and the quality will be perfect with the laser wave length longer than 2400nm.

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93. Photoelectron Spectra Induced by Broad-Band Chaotic Light from a Structured Continuum


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Van Cao Long, Wieslaw Leoński, and Khoa Doan Quoc

Quantum Optics and Engineering Division, Institute of Physics, Zielona Góra University, ul. Prof. A. Szafrana 4a, 65-516 Zielona Góra, Poland The different ionization processes of atoms in laser fields are center of interest in both theoretical and experimental researches in atomic physics since long time. One of the most interesting example of these processes is so-called laser induced autoionisation in which a nontrivial structure of continuum occurs due to mixing of the ionising states with continuum. In this paper we consider a model for laser-induced autoionisation introduced before in [1]. Following [2] we assume that the laser light is decomposed into two parts: the deterministic or coherent part and the one, being randomly fluctuating chaotic component, which is a -correlated, Gaussian, Markov and stationary process (white noise). This model for the field is interesting by itself, because it describes electric field amplitude of the multimode laser, operating without any correlation between the modes. We solve a set of coupled stochastic integro-differential equations, describing a double Fano model for autoionisation. We determine the exact photoelectron spectrum and compare it with our results obtained before in [1] and [2]. Our paper is organised as follows: After an introduction, in the second section we present some details of our model and derive the equation for atomic operators. In the third part our results are presented and discussed. Instead of presenting rather complicated formula (some details of the calculations leading to that formula can be found in the appendix) we have restricted ourselves to the two interesting physical limits: weak and strong fluctuations. References [1] W. Leoński, R. Tanaś and S. Kielich 1987 J. Opt. Soc. Am. B4 72. [2] V. Cao Long, M. Trippenbach 1986 Z. Phys. B 63 267.

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94. Electromagnetically Induced Ionization from Double Autoionizing Levels with Lorentzian Continuum

Wieslaw Leoński, Van Cao Long, and Thuan Bui Dinh

Quantum Optics and Engineering Division, Institute of Physics, Zielona Gora University, ul. Prof. A. Szafrana 4a, 65-516 Zielona Gora, Poland

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In this communication we shall concentrate on the systems of two AI levels ( lebeled by |1> and |2>), coupled to the structured continuum |c ) of the Lorentzian shape with the equal to ΓL. All these states are excited one and are coupled to some discrete ground level |0> by an external coherent electromagnetic field. In fact, Lorentzian shaped continuum is equivalent (and can be replaced by) to the both: flat continuum |c> and coupled to it third AI level |3> . Such replacement can be described in terms of the Fanoprofiles theory [5,6]. [1] Leonski W, Tanas and Kielich 1987 J. Opt. Am.B 4 72. [2] Leonski W and Tanas 1988 J Phys. B:At. Mol. Opt. Phys. 21 2835. [3] Raczynski A, Rzepecka M, Zaremba J and Zielinska-Kaniasty S 2006 Opt.Commun. 266 552. [4]Lewenstein M and Rzcazewski K 2000 Physical review A 61 022105 [5] Fano U 1961 Phys. Rev. 124 1866. [6] Durand Ph, Paidarova I and Gadea F X 2001 J. Phys. B: At. Mol. Opt. Phys 34 1953 [7] Rzazewski K and Eberly J H 1981 Phys. Rev. Lett. 47 408.

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95. Photoelectron Spectra Induced by Broad-Band Chaotic Light from a Structured Sontinuum

Van Cao Long, Wieslaw Leoski, and Khoa Doan Quoc

Quantum Optics and Engineering Division, Institute of Physics, Zielona GÃ³ra University, ul. Prof. A. Szafrana 4a, 65-516 Zielona GÃ³ra, Poland The different ionization processes of atoms in laser fields are center of interest in both theoretical and experimental researches in atomic physics since long time. One of the most interesting example of these processes is so-called laser induced autoionisation in which a nontrivial structure of continuum occurs due to mixing of the ionising states with continuum. In this paper we consider a model for laser-induced autoionisation introduced before in [1]. Following [2] we assume that the laser light is decomposed into two parts: the deterministic or coherent part and the one, being randomly fluctuating chaotic component, which is a -correlated, Gaussian, Markov and stationary process (white noise). This model for the field is interesting by itself, because it describes electric field amplitude of the multimode laser, operating without any correlation between the modes. We solve a set of coupled stochastic integro-differential equations, describing a double Fano model for autoionisation. We determine the exact photoelectron spectrum and compare it with our results obtained before in [1] and [2]. Our paper is organised as follows: After an introduction, in the second section we present some details of our model and derive the equation for atomic operators. In the third part our results are presented and discussed. Instead of presenting rather complicated formula (some details of the calculations leading to that formula can be found in the appendix) we have restricted ourselves to the two interesting physical limits: weak and strong fluctuations. References [1] W. Leoński, R. Tanaś and S. Kielich 1987 J. Opt. Soc. Am. B4 72. [2] V. Cao Long, M. Trippenbach 1986 Z. Phys. B 63 267.

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V. Vật lý tính toán, mô phỏng và mô hình hóa.

96. Inferring Amino Acid Interactions in Proteins using Maximum Entropy Approach

Trinh Xuan Hoang

Institute of Physics, VAST, 10 Dao Tan, Ba Dinh, Ha Noi The principle of maximum entropy is a powerful approach for statistical inference which is maximally non-committal to missing information. We review current methods for deducing knowledge-based potentials in proteins and present a novel technique, based on the principle of maximum entropy, for deriving the solvation energy parameters of amino acids from the knowledge of the solvent accessible areas in experimentally determined native state structures.

Báo cáo Mời

97. Some Theoretical Issues of Wireless High Power Transmissions and a Mathematical Model of the Wireless Solar Power Transmission Problem from an Orbit in the Space to the Earth’s Surface.

Dao Khac An

Institute of Materials Science, VAST, 18 Hoang Quoc Viet, Cau Giay, Hanoi Viet nam The application of radio for telecommunications that has tremendous results throughout the 20th century, where the signals containing structural information with the nano-micro watt ranging power are wirelessly transmitted between stations. In 1900 Nicola Tesla, an inventor and scientist proposed the use of radio waves to transmit power instead of using high voltage power lines. Since then the theoretical and practical results of WPT have not been improved so much. Recently due to a lack of energy supply for the mankind, one has intensively concentrated to develop and solve the issues of wireless power transmission (WPT) for energy charging to the electrical equipments, and also to find sustainable new sources of clean energy. This presentation outlines briefly some issues and challenges of WPT such as some theoretical and methodological


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issues of WPT by near field, by far field, then the presentation will focus on some our research results of building mathematical model of wireless solar power transmission problem from an space orbit to the Earth’s surface using high power microwave beam. The mathematical formulas of Maxwell equation system and formula of high energy flux for WPT with abnormal features of transmission environment and some main influences factors of space and earth’s atmosphere on the WPT are presented. The challenges and orientation developments are also offered and discussed. (computional physics)

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98. Atomic Mechanism of Homogeneous Melting of bcc Fe at Limit of Superheating

Tran Phuoc Duy and Vo Van Hoang

Department of Applied Physics, Faculty of Applied Science, Institute of Technology of HochiMinh City , 268 Ly Thuong Kiet Street, District 10, HochiMinh City-Vietnam Atomic mechanism of homogeneous melting of the bulk body-centered cubic (bcc) Fe has been studied via monitoring spatio-tempmiệng arrangement of liquid-like atoms during heating process. Calculations were performed by molecular dynamics simulation. Liquid-like atoms were detected by the Lindemann critrerion of melting. We found that liquid-like atoms occur randomly in crystalline matrix at temperature far below the melting point due to local instability of the crystal lattice. Number of liquid-like atoms increases with increasing temperature and they have a tendency to form clusters and melting occurs when percolated liquid-like cluster is formed in the crystalline model. Occurrence of melting is also accompanied by the sudden changes in various static and thermodynamic quantities. However, total melting can be reached at the point far above the melting one. We found three characteristic temperatures of the homogeneous melting of bcc Fe.

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99. Computer Simulation of Microscopic Bubbles in Amorphous alloy Co81.5B18.5

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Pham Huu Kien, Pham Khac Hung, and Vu Van Hung

Department of Computational Physics, Hanoi University of Technology. Department of Physics, Hanoi University of Education Simulation of the diffusion mechanism via microscopic bubbles in amorphous materials is carried out using the statistical relaxation models Co81.5B18.5 containing 2×105 atoms. The present work is focused on the role of these bubbles for self-diffusion in amorphous solids. It was found that the numbers of the vacancy bubbles (VB) in amorphous Co81.5B18.5 vary from 1.4×10-3 to 4×10-3 per atom depending on the relaxation degree. The simulation shows the collective character of the atomic movement upon diffusion atoms moving. Due to the large size in comparison with B atom, the jump of a Co diffuses atom leads to a significant local rearrangement of the atoms located near the VB. Meanwhile, B diffuses like the movement of an interstitial impurity through the boron-VB. Diffusion coefficients have been calculated via the vacancy bubbles and they are consistent with experimental data. The effect of the relaxation is also investigated and interpreted as a result of vacancy-bubble annihilation during thermal annealing. Keywords: Bubbles; Amorphous alloys; Vacancy bubbles; Diffusion mechanism; Statistical relaxation.

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100. Computational Design of Mn4 Molecules with Strong Intramolecular Exchange Coupling

Nguyen Anh Tuan (1), Tran Thi Thuy Nu (1), Nguyen Van Thanh (1), Vu Van Khai (1,2), Shin-ichi Katayama (3), Nguyen Huy Sinh (1), Dam Hieu Chi (1,3)

1 Faculty of Physics, Hanoi University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam 2 National Univesity of Civil Engineering, 55 Giai Phong, Hai Ba Trung, Hanoi, Vietnam 3 School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1, Asahidai, Nomi, Ishikawa, 923-1292 Japan Tel.: 01234 686969, Email: [email protected]; [email protected] Single-molecule magnets (SMMs) are high-spin molecules that can function as magnets below their blocking temperature (TB). They


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are being extensively studied due to their potential technological applications to molecular spintronics. However, currently synthesized SMMs have low TB, on the order of several degrees Kenvil. A way to develop SMMs is enhancing their intramolecular exchange coupling to well separate the ground spin state from the excited states. Mn4+Mn3+

3 SMMs having the general chemical formula [Mn4+Mn3+

3(µ3-L2−)3(µ3-X

−)(O2CR)−3(L1,L2)−3] (L = O; X, R, L1 and L2 = various) have been studied by first-principles calculations. It was shown in our previous paper [1] the basic mechanism of AFM Mn4+-Mn3+ coupling (JAB) is determined by delocalization of 3d electrons from the dz2 orbitals at the Mn3+ sites to the t2g orbitals at the Mn4+ site through the p orbitals at the µ3-L

2− (L = O) ions which results in the π-like hybridization states among these orbitals just below the Fermi level. This result allows us to predict that JAB can be structurally controlled, and will be strongest with the Mn3+-L-Mn4+ angle α ≈ 90o, while synthesized Mn4+Mn3+

3 molecules have α ≈ 95o. In this study, to design new Mn4+Mn3+

3 SMMs having much more stable ferrimagnetic state, one approach is suggested. That is designing Mn4+Mn3+

3 molecules having α ≈ 90o by rational variations in ligands. Based on this idea, we succeeded in designing new Mn4+Mn3+

3 molecules having JAB of about 3.5 times stronger than that of the synthesized Mn4+Mn3+

3 molecules. Our calculated results demonstrated that by using nitrogen-based ligands (NR’, R’ = a radical) instead of oxygen to form the exchange pathways between Mn ions, we can design new Mn4+Mn3+

3 molecules having JAB of about 3.5 times stronger than that of the synthesized Mn4+Mn3+

3 molecules. Our calculated results confirmed that JAB tends to strongest with α ≈ 90o. Also our calculated results demonstrated that JAB tends to stronger with decrease of interatomic distance between the Mn4+ and Mn3+ ions (dAB). Based on these magnetostructural correlations, the strong JAB space, 88o ≤ α ≤ 92o and dAB ≤ 2.850 Å, was established. Mn4+Mn3+

3 molecules in this space have JAB at least two times stronger than that of the synthesized Mn4+Mn3+

3 molecules.

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In conclusion, our calculated results demonstrated the advantage of using N-based ligands to control exchange pathways between Mn ions in Mn4 molecules. These results can be applied not only to the specific system studied in this paper but also to other SMM systems. We hope the results would give some hints for synthesizing not only new superior Mn4+Mn3+

3 SMMs, but also other SMM systems Báo cáo Miệng


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101. Study on Lattice and Electronic Structure at the Surface of BaTiO3 Thin Films by DFT Method

Nguyen Thuy Trang, Nguyen Van Chinh, Bach Thanh Cong, and Nguyen Hoang Linh

Hanoi University of Science, 334 Nguyen Trai, Thanh Xuan, Ha Noi The low dimension systems of ferroelectric compounds are suitable for ferroelectric memory applications. Hence, the development of practical ferroelectric memory is in close connection with low-dimension physics of ferroelectric materials. In this paper, we introduce our ab initio calculations on thin films (quasi-two dimension systems Q2D) of the most typical ferroelectric compound BaTiO3 basing on the application of density functional theory (DFT) to the Q2D system. The results showed that the convergences of the models were obtained for the thickness of the vacuum slabs as large as ten times of the atomic slabs within the total energy error ~ 0,01 eV. The BaO-terminated film exhibited smaller surface relaxation than the TiO2-terminated film. This can be explained by the stability of octahedral coordination TiO6. The lattice reconstructions lead to the electronic redistribution at the surface layers which give rise to the difference of the ferroelectricity between the two types of thin films and between the bulk and thin film materials.

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102. Structural Properties of Simulated Liquids and Amorphous GaAs, GaAs2, Ga2As

Tran Thi Thu Hanh and Vo Van Hoang

Department of Applied physics, Institute of Technology National University of Hochiminh City, 268 Ly Thuong Kiet Str., Distr. 10, Hochiminh City, Vietnam The structural properties of liquids and amorphous gallium arsenides have been studied using the molecular dynamics (MD) method. Simulations were done in the basic cube under periodic boundary conditions containing 3000 ions for GaAs, GaAs2, Ga2As models. The microstructure of systems has been analyzed through

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partial radial distribution functions (PRDFs), coordination number distributions, bond-angle distributions and interatomic distances. The evolution of structure upon cooling from the melt of Ga-As was observed and discussed. We found that calculated data agree well with the experimental ones and with those obtained previously in other simulation works. Moreover, temperature dependence of these distributions was obtained.

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103. Properties of Magnetic Nano-Particle Systems: A Monte Carlo Study

Tran Nguyen Lan and Tran Hoang Hai

HoChiMinh City Institute of Physics, VAST, 1 Mac Dinh Chi, Quan 1, Tp. HCM Monte Carlo method is used to study magnetic nano-particle system. We consider samples in two cases, the dilute sample and the dense sample. The anisotropy of each particle is assumed as uniaxial and has the random orientation. First, we extract the energy barrier to show the role of the poly-dispersity and the concentration. We consider influence of sample conditions on the coercive field and the blocking temperature. We found that the poly-dispersity play demagnetized role at both the low- and high-temperature, while the concentration deduce the decrease of the coercive field at the low-temperature and the increase of the blocking temperature. We use the temperature dependence of the coercive field to show the transition temperature, which separates the collective states at low- and high-temperature, arising due to the inter-particle interaction. The field dependence of the blocking temperature also found, the curvature changes from bell-like shape to plateau-like shape along with the increase of the concentration of samples. The invalidities of the classical expressions also were discussed

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104. Efficient 3D Poisson Solvers Based on post-BICGSTAB Algorithms: BICGSTAB (L), Enhanced BICGSTAB (L)

Dinh Nhu Thao and Tran Thien Lan


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College of Education, Hue University, 34 Le Loi Street, Hue City, Vietnam We built efficient 3D Poisson solvers based on post-BICGSTAB algorithms: BICGSTAB (L), enhanced BICGSTAB (L). Calculations are performed on Windows computers. It is showed that these solvers work very well in uniform grids. Convergent characteristics are improved very significantly and memory size is minimized. Consequently, the solvers are hundred times faster than solvers based on LU decomposition, Gauss’s elimination, Jacobi and Gauss-Seidel iteration algorithms.

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105. 3D Monte Carlo Simulation of GaAs p-i-n Diodes Taking into Account the Near Coulomb Interaction between Electrons and Holes

Dinh Nhu Thao and Tran Thien Lan

College of Education, Hue University, 34 Le Loi Street, Hue City, Vietnam This paper presents 3D simulation of carrier dynamics in GaAs p-i-n diodes taking into account the near Coulomb interaction between electrons and holes. The device simulation is carried out with various electric fields of 70, 100 and 130 kV/cm. The simulation results show that the interaction gives a correction of 10^6 V/m, equal to 1/10 the total electric field in the devices. The results also show that the velocity overshoot and the velocities obtained are nearly the same in both cases: with and without the near Coulomb interaction. This indicates that the near Coulomb interaction has no important role in carrier dynamics and it can be ignored in usual calculations.

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106. 3D Monte Carlo Simulation of Carrier Dynamics and THz Radiation from GaAs p-i-n Diodes

Dinh Nhu Thao and Le Hoai Linh

College of Education, Hue University, 34 Le Loi Street, Hue City, Vietnam In this paper we present 3D simulation of carrier dynamics and THz radiation from GaAs p-i-n diodes. We built a 3D device simulator

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with a Poisson solver based on BiCGSTAB algorithm. The results are consistent with 1D simulation ones. They confirm effect of 1D model in considering p-i-n diodes. They also show that THz radiation are really from LO phonons but from TO phonons, and the obvious coupling of light from carrier acceleration and LO phonons.

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107. Density Functional Based Study on Zinc Oxide Nanoparticles

Vu Ngoc Tuoc and Nguyen Viet Minh

Hanoi University of Science and Technology We have performed the Density Functional Tight Binding (DFTB) study on the structural properties of Zinc Oxide Nanoparticles (NP), focusing on the effects induced by the surfaces and quantum size effect. Effects of surface relaxation and surface stress which is absent in atomistic model are taken carefully into account. The studying Nanoparticle's size range up to 2.5nm. We illustrated the structural properties changes by decreasing NP sizes while the typical length of surface relaxation (~1 nm) remain unchanged and comparable with the particle size. The NP electronic properties, i.e. Density of State (DOS), charge transfer in hetero-bond also showed the deviation from bulk material value.

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108. Computer Simulation of Diffusion in Disordered Systems with many Particles

P.K.Hung and T.V.Mung

Department of Computational Physics, Hanoi University of Technology, 1 Dai Co Viet, Hanoi Understanding the microscopic mechanism of diffusion in amorphous materials remains a challenge in physics and material science. Previous simulations of diffusion of particle alone in disordered system show two specific features which are common for the dynamic in amorphous materials, however, the presence of large number of impurity has not been considered yet. In the present paper we shows a new simulation technique enabling to consider the diffusion of many impurities in disordered system. The


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simulation in linear chain consisting of several thousand sites has been conducted. The concentration of impurities varies in the range from 0 to 0.2. Two-level sates are applied for site and transition energies. The simulation result indicates a significant influence of the impurity concentration for systems where the disorder degree is strong. This result could explain qualitatively the concentration effect which is experimentally observed for diffusion of light atoms in amorphous alloys.

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109. Structure and Dynamics of Gold-Silicon Alloy by Molecular Dynamics Simulation

T. L. Thuy. Nguyen (1), Noel Jakse (1) and Alain Pasturel (1,2) 1. Laboratoire Sciences et Ingénierie, Matériaux et Procédés, UMR CNRS-INPG-UJF 5266, PHELMA-Grenoble-INP, BP 75, 38402 Saint Martin d'Hères Cedex, France. 2. Laboratoire de Physique et Modélisation des Milieux Condensés, UMR-CNRS 5493, Maison des Magistères, BP 166 CNRS, 38042 Grenoble-Cedex09, France. A series of molecular dynamics simulations for the liquid, supercooled states of Au-Si alloy at the eutectic composition are presented. The interactions are described via a modified embedded-atom model (MEAM) for which several parameter sets exist.. The structural properties, namely, the pair-correlation functions, coordination numbers and the abundance of bonded pairs from the common neighbor analysis, and the dynamic properties through the self-diffusion coefficients are calculated and the results are compared to ab initio molecular dynamics data. An analysis of the various parameterizations is provided and improvements are proposed.

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110. Accelerated MD Programm using CUDA Technology

Nguyen Thu Nhan, Nguyen Thi Thanh Ha, and Pham Khac Hung

Hanoi University of Technology, 1 Dai Co Viet, Hai Ba Trung, Ha Noi Molecular dynamic (MD) simulation is proven to be an important tool to study the structure as well as the physical properties at atomic level in material science. However, it requires a huge computing time and hence limits the ability to treat a large scale simulation. In this paper we present a solution to speed up the MD simulation using CUDA technology (Compute Unified Device Architecture). We used the GeForce GTS 250 card with Version 2.30. The simulation is implemented for Lennard-Jones systems with periodic boundary conditions which consist of 1024, 2048,


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4096 and 8192 atoms. The calculation shows that the computing time depends on the size of system and could be decreased to 35 times. This result indicates a posibility of constructing a large MD model up to with 105 atoms on the PC.

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111. Study of Size Effect and Thermal Characteristics of Nanoparticles using Computer Simulation

Nguyen Thi Thao, Le Thi Phuong, and Pham Khac Hung

Hanoi University of Technology, 1 Dai Co Viet, Hai Ba Trung, Ha Noi We present a result of molecular dynamic simulation of nanoparticle with spherical and cubical shape. Three models with size of 1000, 2000 and 3000 atoms have been constructed using the Lennard-Jones potentials. We focus on the size dependence of melting temperature as well as the local structure of nanoparticle under heating and cooling. The simulation result shows that the considered quantities are weakly dependent on the shape of nanoparticle, meanwhile the size effect exhibits clearly on the melting temperature and local microstructure. The simulation has been also conducted for nanoparticles Pt, Ag and Au which found a wide application in material industry. The size effect and thermal characteristics of those nanoparticles also are presented and discussed here.

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VI. Vật lý các vật liệu mềm và các lĩnh vực khác.

112. Evolution of Protein-Protein Interaction Networks in Duplication-Divergence Model

Bui Phuong Thuy (1) and Trinh Xuan Hoang (2)

(1) Nam Dinh University of Technology Education, Phu Nghia, Loc Ha, Nam Dinh, Vietnam; (2) Institute of Physics, Vietnamese Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Ha Noi, Vietnam Protein interacts with one another resulting in complex functionalities of living organisms. Like many other real-world networks, networks of protein-protein interactions possess certain degree of orderness such as the scale-free property. The latter means that the probability P to find a protein that interacts with k other proteins follows a power law, P(k) ~ k^{-\gamma}. Protein interaction networks (PINs) have been studied by using stochastic graph generating models. The duplication-divergence model is a model based on the evolutional properties of gene duplication and divergence. This simple model successfully shows how evolution can create scale-free networks. In this work, we show that the model can be improved by introducing some modifications to the divergence step and the initial conditions of the network growth. The model is well fitted to the latest experimental data on the PIN of single-celled yeast Saccharomyces cerevisiae.

Báo cáo Miệng

113. On the Information Problem of DNA in the Denaturation Process

Vy Thi Ha My, Vu Thu Huong, Chu Thuy Anh, To Thi Thao, Ngo Van Thanh, and Nguyen Ai Viet Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Ha Noi The information problem of DNA in the denaturation process was studied by the relationship between entropy and information. Using the previous PB’s (Peyrard and Bishop) numerical results obtained from their microscopic arharmonic model of DNA, we propose a new effective simple model to caculate DNA information. A shape


99

change of information at the denaturation phase transition point was found and discussed.

Báo cáo Treo

114. The Simple Approximate Formula of the Curve of Rate Constant "k" for Medium Temperature Range in the Photosynthetic Reaction of Bacterial.

V.T.H Yen, T.T.T Thuy, T.T Thao, N.V Thanh, and N.A Viet

Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Ha Noi Photosynthesis converts light energy into chemical free energy - the most important process of life on the Earth was investigated. Using classic theory and quantum - mechanical aspects, the rate constant “k” for electron transfer is studied. For practical use, in the low and high temperature limits the values of k in literatures are approximated by two straight lines, while in medium case there is alike curve. In this report, a simple approximate formula of the curve of rate constant “k” is proposed for medium temperature range. The comparison has shown the quite good agreement between our calculated results from that simple formula and the experimental data in medium temperature range for both fast and slow phases.

Báo cáo Treo

Tp. Hồ Chí Minh, 02-06/8/2010

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(Thành phố Hồ Chí Minh, 02 – 06/08/2010)

DANH SÁCH ĐĂNG KÝ ĐẠI BIỂU TT Họ và tên Email Cơ quan

1 Đào Khắc An [email protected] VKHVL, HN

2 Võ Xuân Ân [email protected] ĐHCN, HCM

3 Chu Thùy Anh [email protected] VVL, HN

4 Lê Hoàng Anh [email protected] ĐHBK, HN

5 Nguyễn Phương Duy Anh [email protected] ĐHTD Một

6 Phan Đức Anh [email protected] VVL, HN

7 Vũ Xuân Bách [email protected] ĐHKHTN, HN

8 Nguyễn Huy Bằng [email protected] ĐH Vinh

9 Trần Thoại Duy Bảo [email protected] VVL, HCM

10 Nguyễn Quang Báu [email protected] ĐHKHTN, HN

11 Chu Văn Biên [email protected] ĐHHĐ, TH

12 Nguyễn Dương Bộ [email protected] ĐHSP, HNII

13 Chia-Chu Chen [email protected] National Cheng-Kung Uni.

14 Đỗ Đình Chiểu ĐH Pari

15 Vũ Xuân Chung [email protected] ĐHKHTN, HN

16 Nguyễn Chính Cương [email protected] ĐHSP, HN

17 Nguyễn Như Đạt [email protected] VVL, HN

18 Trần Quốc Đạt [email protected] ĐH TNguyên

19 Nguyễn Đắc Diện [email protected] ĐHBK, HN

20 Lê Đình [email protected] ĐHSP, Huế

21 Ngô Thị Thu Dinh [email protected] ĐHKHTN, HN

22 Lê Văn Đoài [email protected] ĐH Vinh

23 Phùng Văn Đồng [email protected] VVL, HN

24 Nguyễn Hữu Dư [email protected] TTGDTX, Cao Lãnh

25 Đào Vọng Đức [email protected] VVL, HN


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26 Đinh Lưu Minh Đức [email protected] THPT Châu Thành 2

27 Trương Minh Đức [email protected] ĐHSP, Huế

28 Đoàn Trí Dũng [email protected] VVL, HCM

29 Hồ Trung Dũng [email protected] VVL, HCM

30 Ngũ Văn Dũng [email protected] Fujikura Fiber Optics Vietnam

31 Nguyễn Tiến Dũng [email protected] ĐH Vinh

32 Trần Nguyễn Dũng [email protected] VVL, HN

33 Trần Phước Duy [email protected] ĐHBK, HCM

34 Trương Minh Duy [email protected] ĐHKHTN, HCM

35 Nguyễn Bích Hà [email protected] VKHVL, HN

36 Nguyễn Hồng Hà [email protected] VVL, HN

37 Nguyễn Thị Thanh Hà [email protected] ĐHKHTN, HN

38 Nguyễn Thu Hà [email protected] HVKT MM

39 Tô Bá Hạ [email protected] HVKT QS

40 Đặng Thanh Hải [email protected] NXB GD VN

41 Lê Thanh Hải [email protected] ĐHXD HN

42 Nguyễn Minh Hải [email protected] THPT Thanh Bình

43 Nguyễn Thanh Hải [email protected] ĐHBK, HN

44 Trần Thị Hải [email protected] ĐHKHTN, HN

45 Nguyễn Suân Hãn [email protected] ĐHKHTN, HN

46 Phạm Thị Kim Hằng [email protected] VVL, HN

47 Lê Thị Ngọc Hạnh [email protected] THPT Trần Phú

48 Trần Thị Thu Hạnh [email protected] ĐHBK, HCM

49 Trần Minh Hiến [email protected] VVL, HCM

50 Trần Minh Hiền [email protected] VVL, HCM

51 Hồ Khắc Hiếu [email protected] ĐHXD HN

52 Nguyễn Văn Hiệu [email protected] VKHVL, HN

53 Trần Minh Hiếu [email protected] ĐHBK, HN

54 Nguyễn Văn Hoa [email protected] ĐHSP, HCM

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55 Lê Viết Hòa [email protected] ĐHSP, HN

56 Nguyễn Văn Hoá [email protected] ĐHHĐ, TH

57 Phù Chí Hòa [email protected] ĐH Đà Lạt

58 Nguyễn Quốc Hoàn [email protected] ĐHBK, HN

59 Lê Văn Hoàng [email protected] ĐHSP HCM

60 Nguyễn Lê Hoàng [email protected] ĐHKHTN, HCM

61 Trịnh Xuân Hoàng [email protected] VVL, HN

62 Nguyễn Quang Học [email protected] ĐHSP, HN

63 Đỗ Xuân Hội [email protected] ĐHQG HCM

64 Đào Thị Hồng [email protected] VVL, HN

65 Lê Đình Hồng [email protected] ĐHSP, HN

66 Nguyễn Trung Hồng [email protected] ĐHBK, HN

67 Phan Thị Thanh Hồng [email protected] ĐHSP, HNII

68 Nguyễn Văn Hợp [email protected] ĐHSP, HN

69 Lê Thọ Huệ [email protected] VVL, HN

70 Đỗ Mạnh Hùng [email protected] THPT Chuyên VP

71 Hà Thanh Hùng [email protected] ĐHSP, HNII

72 Hoàng Văn Hưng [email protected] ĐHSP HCM

73 Nguyễn Bá Hưng [email protected] HVQY

74 Vũ Văn Hùng [email protected] ĐHSP, HN

75 Lê Thị Thanh Hương [email protected] ĐHHP

76 Hồ Xuân Huy [email protected] ĐHAG

77 Võ Phước Huy [email protected] ĐHBL

78 Đỗ Khoa Thúy Kha [email protected] ĐH Huế

79 Nguyễn Quốc Khánh [email protected] ĐHKHTN, HCM

80 Phan Hồng Khiêm [email protected] ĐHKHTN, HCM

81 Đào Tiến Khoa [email protected] VKHKTHN, HN

82 Hoàng Hồng Khuê [email protected] ĐH Vinh

83 Bùi Văn Khuể [email protected] ĐH Hải Phòng


103

84 Phạm Hữu Kiên [email protected] ĐHBK, HN

85 Trương Thúy Kiều [email protected] VVL, HCM

86 Võ Thành Lâm [email protected] ĐH SG

87 Nguyễn Quỳnh Lan [email protected] ĐHSP, HN

88 Nguyễn Trí Lân [email protected] VVL, HN

89 Trần Nguyên Lân [email protected] VVL, HCM

90 Trần Thiện Lân [email protected] ĐHSP, Huế

91 Chu Văn Lanh [email protected] ĐH Vinh

92 Nguyễn Như Lê [email protected] ĐH Huế

93 Nguyễn Văn Liễn [email protected] VVL, HN

94 Nguyễn Thùy Linh [email protected] ĐHKHTN, HN

95 Phạm Quốc Lịnh [email protected] THPT DTNT Cà Mau

96 Nguyễn Thị Hà Loan [email protected] ĐHSP, HNII

97 Hoàng Ngọc Long [email protected] VVL, HN

98 Nguyễn Văn Long [email protected] CĐSP Gia Lai

99 Nguyễn Duy Lý [email protected] ĐH Văn Lang

100 Bruce H J McKellar [email protected] Univ of Melbourne, Australia

101 Nguyễn Viết Minh [email protected] ĐHBK, HN

102 Trịnh Văn Mừng [email protected] ĐHBK, HN

103 Vy Thị Hà My [email protected] ĐHSP, HN

104 Đỗ Vân Nam [email protected] ĐHBK, HN

105 Nguyễn Đình Nam [email protected] ĐHKHTN, HN

106 Nguyễn Ngọc Thành Nam [email protected] ĐHKHTN, HCM

107 Phạm Thị Thanh Nga [email protected] ĐHTL, HN

108 Nguyễn Văn Nghĩa [email protected] ĐHTL, HN

109 Bạch Như Nguyện [email protected] MIC

110 Nguyễn Thu Nhàn [email protected] ĐHBK, HN

111 Nguyễn Vũ Nhân [email protected] HVPK - KQ

112 Phan Thị An Nhàn [email protected] ĐH Cần Thơ

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113 Võ Văn Ớn [email protected] ĐHTD Một

114 Phùng Đình Phong [email protected] ĐHSP, HNII

115 Trần Công Phong [email protected] ĐH Huế

116 Nguyễn Văn Phú [email protected] ĐH Vinh

117 Huỳnh Vĩnh Phúc [email protected] ĐH Đồng Tháp

118 Lê Thị Thu Phương [email protected] ĐHSP, Huế

119 Lê Thu Phương [email protected] ĐHKHTN, HN

120 Phạm Việt Phương [email protected] ĐH Sungkyunkwan HQ

121 Đoàn Nhật Quang [email protected] VVL, HN

122 Nguyễn Hồng Quang [email protected] VVL, HN

123 Nguyễn Chánh Quí [email protected] ĐH Cần Thơ

124 Hồ Quang Quý [email protected] HVKT QS

125 Piotr Rozmej [email protected]

126 Bounyavong sengthong [email protected] VVL, HN

127 Nguyễn Huy Sinh [email protected] ĐHKHTN, HN

128 Vetpany SIVONGXAY [email protected] VVL, HN

129 Đặng Văn Soa [email protected] ĐHSP, HN

130 Nguyễn Hồng Sơn [email protected] ĐHCĐ, HN

131 Nguyễn Thành Sơn [email protected] ĐHKT, HCM

132 Phạm Ngọc Sơn [email protected] VNC Đà Lạt

133 Trần Ngọc Sương [email protected] THPT Tam Bình

134 Võ Văn Tài [email protected] ĐHKHTN, HCM

135 Nguyễn Thị Thanh Tâm [email protected] ĐH QNam

136 Phạm Đình Tám [email protected] HVKT QS

137 Trịnh Văn Thà [email protected] THPT Tam Nông

138 Hoàng Văn Thái [email protected] THPT Việt Đức

139 Vũ Kim Thái [email protected] ĐHKH KTCN

140 Đỗ Đình Thanh ĐHSP, HN


105

141 Lưu Thị Kim Thanh [email protected] ĐHSP, HNII

142 Nguyễn Văn Thạnh [email protected] ĐHKH Huế

143 Thái Doãn Thanh [email protected] ĐHCN TP, HCM

144 Đinh Như Thảo [email protected] ĐHSP, Huế

145 Lê Phương Thảo [email protected] ĐHKHTN, HN

146 Nguyễn Huy Thảo [email protected] ĐHSP, HNII

147 Nguyễn Thị Thảo [email protected] ĐHBK, HN

148 Phạm Hương Thảo [email protected] ĐHKHTN, HN

149 Cao Huy Thiện [email protected] VVL, HCM

150 Nguyễn Văn Thịnh [email protected] ĐHBL

151 Nguyễn Viễn Thọ [email protected] ĐHBK, HN

152 Nguyễn Hà Thu [email protected] HVPK - KQ

153 Nguyễn Khắc Thuận [email protected] HVPK - KQ

154 Nguyễn Văn Thuận [email protected] ĐHSP, HN

155 Nguyễn Thị Thương [email protected] ĐHBK, HN

156 Bùi Phương Thúy [email protected] ĐHSP KT Nam Định

157 Nguyễn Thị Thúy [email protected] VVL, HN

158 Nguyễn Thị Lệ Thủy [email protected] Labo SIMAP

159 Trần Thanh Thúy [email protected] VVL, HN

160 Hoàng Văn Tích [email protected] ĐHSP, HN

161 Lê Văn Tiến [email protected] VCH&THUD, HCM

162 Tống Sỹ Tiến [email protected] ĐHKHTN, HN

163 Nguyễn Công Toản [email protected] ĐHKHTN, HN

164 Nguyễn Thùy Trang [email protected] ĐHKHTN, HN

165 Triệu Quỳnh Trang [email protected] CĐSP, Nam Định

166 Nguyễn Hoàng Minh Trí [email protected] ĐH Đồng Tháp

167 Nguyễn Bảo Trung [email protected] ĐHKHTN, HN

168 Nguyễn Quý Trường [email protected] ĐHKH

Tp. Hồ Chí Minh, 02-06/8/2010

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169 Đinh Văn Tuân [email protected] ĐHKHTN, HCM

170 Hoàng Anh Tuấn [email protected] VVL, HN

171 Lê Tuấn [email protected] ĐHBK, HN

172 Nguyễn Anh Tuấn [email protected] ĐHBK, HN

173 Nguyễn Anh Tuấn [email protected] ĐHKHTN, HN

174 Trương Văn Tuấn [email protected] Trường SQQS

175 Lương Văn Tùng [email protected] ĐH Đồng Tháp

176 Nguyễn Huyền Tụng [email protected] ĐHBK, HN

177 Nguyễn Ngọc Ty [email protected] ĐHSP HCM

178 Cao Long Vân [email protected]

179 Võ Văn Viên [email protected] ĐH TNguyên

180 Nguyễn Ái Việt [email protected] VVL, HN

181 Đinh Quang Vinh [email protected] ĐHSP, HN

182 Nguyễn Hoàng Vũ [email protected] ĐHKHTN, HCM

183 Lê Thị Hải Yến [email protected] ĐHKHTN, HN

184 Vũ Thị Hải Yến [email protected] VVL, HN

185 Vũ Thị Hải Yến VVL, HN

DANH SÁCH TÊN VIẾT TẮT

Tên CQ viết tắt Tên CQ đầy đủ

CĐSP Gia Lai Cao Đẳng Sư phạm Gia Lai

CĐSP, Nam Định Cao đẳng Sư phạm Nam Định

ĐH Cần Thơ Đại học Cần Thơ

ĐH Đà Lạt Đại học Đà Lạt

ĐH Đồng Tháp Đại học Đồng Tháp

ĐH Hải Phòng Đại học Hải Phòng

ĐH Huế Đại học Huế

ĐH QNam Đại học Quảng Nam

ĐH SG Đại học Sài Gòn

ĐH Sungkyunkwan HQ Trường Đại học Sungkyunkwan Hàn Quốc


107

ĐH TNguyên Đại học Tây Nguyên

ĐH Văn Lang Đại học Văn Lang

ĐH Vinh Đại học Vinh

ĐHAG Đại học An Giang

ĐHBK, HCM Đại học Bách khoa Hồ Chí Minh

ĐHBK, HN Đại học Bách khoa Hà Nội

ĐHBL Đại học Bạc Liêu

ĐHCĐ, HN Đại học Công Đoàn Hà Nội

ĐHCN TP, HCM Đại học Công nghiệp thực phẩm Hồ Chí Minh

ĐHCN, HCM Đại học Công nghiệp Thành phố Hồ Chí Minh

ĐHHĐ, TH Đại học Hồng Đức Thanh Hóa

ĐHHP Đại học Hải Phòng

ĐHKH Đại học Khoa học

ĐHKH Huế Đại học Khoa học Huế

ĐHKH KTCN Đại học Khoa học Kỹ thuật Công nghiệp

ĐHKHTN, HCM Đại học Khoa học Tự nhiên Hồ Chí Minh

ĐHKHTN, HN Đại học Khoa học Tự nhiên Hà Nội

ĐHKT, HCM Đại học Kiến trúc Tp. Hồ Chí Minh

ĐHQG HCM Đại học Quốc gia Hồ Chí Minh

ĐHSP HCM Đại học Sư phạm Hồ Chí Minh

ĐHSP KT Nam Định Đại học Sư phạm kỹ thuật Nam Định

ĐHSP, HN Đại học Sư phạm Hà Nội

ĐHSP, HNII Đại học Sư phạm Hà Nội 2

ĐHSP, Huế Đại học Sư phạm Huế

ĐHTD Một Đại học Thủ Dầu Một

ĐHTL, HN Đại học Thủy Lợi Hà Nội

ĐHXD HN Đại học Xây dựng Hà Nội

Fujikura Fiber Optics Vietnam Fujikura Fiber Optics Vietnam

HVKT MM Học Viện kỹ thuật mật mã

HVKT QS Học viện Kỹ thuật quân sự

Tp. Hồ Chí Minh, 02-06/8/2010

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HVPK - KQ Học viện Phòng không – Không quân

HVQY Học viện Quân y

Labo SIMAP Labo SIMAP

MIC Văn phòng đại diện của MIC

National Cheng-Kung Uni. National Cheng-Kung University

NXB GD VN Nhà Xuất bản giáo dục Việt Nam

THPT Châu Thành 2 Trường THPT Châu Thành 2, Đồng Tháp

THPT Chuyên VP Trường THPT Chuyên Vĩnh Phúc

THPT DTNT Cà Mau Trường THPT dân tộc nội trú Cà Mau

THPT Tam Bình Trường THPT Tam Bình

THPT Tam Nông Trường THPT Tam Nông, Đồng Tháp

THPT Thanh Bình Trường THPT Thanh Bình 1

THPT Trần Phú Trường THPT Trần Phú

THPT Việt Đức Trường THPT Việt Đức

Trường SQQS Trường sĩ quan quân sự

TTGDTX, Cao Lãnh Trung tâm Giáo dục thường xuyên H. Cao Lãnh

VCH&THUD, HCM Viện cơ học và tin học ứng dụng Thành phố Hồ Chí Minh

VKHKTHN, HN Viện Khoa học và Kỹ thuật Hạt nhân, Hà Nội

VKHVL, HN Viện Khoa học Vật liệu, Hà Nội

VNC Đà Lạt Viện nghiên cứu hạt nhân Đà Lạt

VVL, HCM Viện Vật lý, Tp. Hồ Chí Minh

VVL, HN Viện Vật lý, Hà Nội

FPA Faculty of Physics and Astronomy


109

Chỉ dẫn tác giả

Tp. Hồ Chí Minh, 02-06/8/2010

110

Alain Pasturel.......................... 22, 101

Bach Thanh Cong..................... 13, 96

Bruce McKellar ........................... 6, 29

Bui Phuong Thuy .................... 25, 103

Bui Sy Khiem, ............................. 7, 72

Bui Dinh Thuan ......................... 11, 88

Bui Van Khue............................ 15, 61

Cao Ho Thanh Xuan ................. 12, 72

Cao Huy Thien.......................... 14, 42

Cao Long Van11, 20, 21, 82, 86, 88, 89

Chia-Chu Chen ......................... 21, 75

Chu Thuy Anh............. 21, 22, 73, 103

Chu Van Lanh............................. 7, 72

D. N. Nghia ............................... 21, 85

D. T. Huong .............................. 24, 31

Dam Hieu Chi ................................. 94

Dang Thanh Hai........................ 19, 63

Dang Van Soa ............................ 8, 37

Dao Khac An....................... 24, 25, 91

Dao Tien Khoa.......................... 25, 28

Dao Vong Duc ................ 8, 16, 35, 37

Dinh Nhu Thao.......... 8, 12, 21, 98, 99

Dinh Quang Vinh .......... 10, 19, 66, 67

Dinh Van Tuan.......................... 25, 46

Dinh Xuan Khoa........................ 76, 77

Do Manh Hung............................ 9, 51

Do Phuong Lien ........................ 18, 59

Do Van Nam ................... 9, 25, 43, 47

Doan Hoai Son ......................... 21, 82

Doan Nhat Quang..................... 15, 46

Doan Quoc Khoa .......... 11, 20, 86, 89

Doan Tri Dung .................... 14, 23, 42

Duong Dai Phuong ................... 17, 40

Duong Xuan Long..................... 14, 45

Ha Huy Bang .............................. 8, 40

Ha Thanh Hung ........................ 16, 36

Ho Khac Hieu............................ 15, 61

Ho Quang Quy................ 7, 11, 72, 84

Ho Sy Ta..................................... 9, 47

Ho Trung Dung ............... 7, 21, 70, 79

Hoang Anh Tuan....................... 19, 57

Hoang Hong Khue .................... 20, 76

Hoang Ngoc Long8, 16, 24, 31, 36, 37

Hoang Van Hung ...................... 11, 81

Hoang Van Thai........................ 10, 66

Hui-Min Lin ............................... 21, 75

Huynh Thi Trang Dai ................ 16, 35

Huynh Vinh Phuc...................... 15, 44

Huynh Xuan Lam...................... 17, 39

J. Gueder.................................. 23, 43

K. Masuda-Jindo....................... 20, 64

L. C. Tuong............................... 14, 31

L. T. Hue................................... 16, 36

L. V. Nam.................................. 21, 85

Le Canh Trung.............. 12, 20, 77, 78

Le Dinh ......................... 15, 18, 44, 48

Le Dinh Hong............................ 10, 64

Le Hai My Ngan........................ 11, 81

Le Hoai Linh ............................. 12, 99

Le Hoang Anh............................. 9, 47

Le Phuong Thao ......................... 7, 40

Le Quoc Anh............................. 18, 48

Le Thanh Hai ............................ 18, 50

Le Thi Binh ............................... 19, 63

Le Thi Cam Tu.......................... 11, 81

Le Thi Hai Yen.......................... 17, 41

Le Thi Mai Thanh...................... 20, 64

Le Thi Phuong ........................ 22, 102

Le Thi Thu Phuong10, 15, 18, 26, 44, 45, 56

Le Tien Hai ............................... 19, 66

Le Tuan .................................... 18, 58

Le Van Doai.............................. 20, 76

Le Van Hoang11, 12, 20, 72, 79, 81, 86

Le Viet Hoa..................... 8, 24, 30, 38

Luong Khanh Toan ................... 17, 35

Luong Van Tung ........... 18, 19, 52, 56

Luu Thi Kim Thanh ............. 17, 35, 40

Mai Thi Linh Chi........................ 17, 35

N. H. Cong................................ 21, 85

N. H.Thao ................................... 8, 37

N. T. Thuy................................. 24, 31

N.N. Tuan ................................... 9, 58

N.V. Minh.................................... 9, 58

Ngo Thi Thanh Ha .................... 18, 56

Ngo Thi Thu Dinh ..................... 23, 34

Ngo Thi Thuy Trang.................. 11, 85


111

Ngo Van Thanh10, 21, 22, 49, 73, 103, 104

Nguyen Ai Viet10, 21, 22, 49, 73, 103, 104

Nguyen Anh Tuan......... 16, 18, 59, 94

Nguyen Bao Trung.................... 10, 67

Nguyen Bich Ha.......................... 6, 69

Nguyen Chanh Qui ................... 11, 82

Nguyen Chinh Cuong ................. 8, 38

Nguyen Cong Toan................... 10, 67

Nguyen Dinh Dung7, 8, 17, 33, 34, 40

Nguyen Dinh Nam ...................... 9, 51

Nguyen Dinh Tuan.................... 17, 40

Nguyen Duong Bo .................... 14, 45

Nguyen Hoang Linh .................. 13, 96

Nguyen Hoang Minh Tri............ 20, 76

Nguyen Hong Quang ................ 14, 45

Nguyen Huy Bang... 71, 74, 76, 78, 82

Nguyen Huy Sinh...................... 16, 94

Nguyen Huyen Tung..... 15, 18, 46, 50

Nguyen Minh Hai ...................... 21, 82

Nguyen Ngoc Ty ........... 11, 12, 81, 86

Nguyen Nhu Dat14, 18, 23, 42, 45, 50

Nguyen Nhu Le........................... 8, 36

Nguyen Phuong Duy Anh ......... 12, 72

Nguyen Quang Bau ........ 9, 51, 55, 56

Nguyen Quang Hoc10, 15, 19, 62, 66, 67

Nguyen Quoc Hoan .................. 14, 33

Nguyen Quoc Khanh19, 25, 46, 57, 60

Nguyen Quynh Lan................... 14, 31

Nguyen Suan Han .................... 17, 41

Nguyen Thanh Hai.................... 11, 63

Nguyen Thanh Son................... 20, 79

Nguyen Thanh Tien .................. 46, 58

Nguyen Thanh Vinh .................. 12, 74

Nguyen Thi Ha Loan................... 8, 37

Nguyen Thi Ha Trang ................. 7, 72

Nguyen Thi Nguyet ................... 12, 81

Nguyen Thi Thanh Ha............. 13, 101

Nguyen Thi Thanh Nhan........... 18, 56

Nguyen Thi Thanh Tam............ 11, 84

Nguyen Thi Thao .................... 22, 102

Nguyen Thi Thu Huong............... 8, 40

Nguyen Thi Thuong .................... 9, 58

Nguyen Thu Ha......................... 10, 64

Nguyen Thu Nhan ...... 13, 19, 65, 101

Nguyen Thuy Linh .................... 26, 45

Nguyen Thuy Trang.................. 13, 96

Nguyen Tien Dung7, 12, 20, 71, 74, 77, 78

Nguyen Toan Thang................. 10, 54

Nguyen Tri Lan ........................... 9, 53

Nguyen Trung Hong ................. 18, 50

Nguyen Tuan Anh........... 8, 24, 30, 38

Nguyen Van Chinh ................... 13, 96

Nguyen Van Hieu ....................... 6, 69

Nguyen Van Hoa ...................... 12, 72

Nguyen Van Hop ...................... 20, 80

Nguyen Van Hung ........ 10, 15, 61, 67

Nguyen Van Long........... 8, 24, 30, 38

Nguyen Van Nghia ..................... 9, 55

Nguyen Van Phu ...................... 21, 82

Nguyen Van Thanh................... 16, 94

Nguyen Van Thinh........ 12, 20, 77, 78

Nguyen Van Thuan................... 24, 30

Nguyen Vien Tho...................... 14, 33

Nguyen Viet Minh ........... 9, 12, 53, 99

Nguyen Vinh Quang ........... 11, 21, 82

Nguyen Vu Nhan ...................... 26, 45

Nobuchika Okada ..................... 24, 29

Noel Jakse.............................. 22, 101

Pham Dinh Tam............ 15, 19, 62, 66

Pham Duy Tan.............. 15, 19, 62, 66

Pham Hong Phong ............. 11, 21, 82

Pham Huu Kien ........................ 25, 93

Pham Khac Hung13, 19, 22, 25, 65, 93, 100, 101, 102

Pham Ngoc Son ....................... 17, 39

Pham Quang Hung..................... 8, 36

Pham Quoc Linh....................... 20, 77

Pham Thi Thanh Nga ............... 10, 54

Pham Van Trong ........................ 7, 71

Phan Duc Anh .............. 10, 22, 49, 73

Phan Hoang Chuong .... 13, 20, 75, 76

Phan Thi An Nhan .................... 21, 82

Phan Thi Thanh Hong .............. 15, 61

Phu Chi Hoa ............................. 17, 39

Phung Dinh Phong ................... 15, 62

Phung Van Dong ...... 8, 24, 28, 34, 37

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112

Piotr Rozmej ............................. 14, 32

S. W. Kock ................................ 23, 43

Shin-ichi Katayama................... 16, 94

T. D. Thanh............................... 21, 85

T. L. Thuy. Nguyen ................. 22, 101

T. Meier..................................... 23, 43

T.D. Doan ................................. 23, 43

T.T.T Thuy .............................. 22, 104

T.T.T. Van................................. 10, 49

Nguyen Van Hoa ...................... 11, 84

To Ba Ha................................... 14, 33

To Thi Thao .. 10, 21, 22, 49, 103, 104

Tong Sy Tien ............................ 10, 67

Tran Cong Phong10, 18, 44, 48, 52, 56

Tran Dinh Hien.......................... 10, 56

Tran Hoang Hai ........................ 22, 97

Tran Huu Phat ................ 8, 24, 30, 38

Tran Manh Cuong..................... 12, 74

Tran Minh Hien ......................... 21, 79

Tran Minh Hieu ......................... 24, 29

Tran Nguyen Dung ..................... 9, 49

Tran Nguyen Lan ...................... 22, 97

Tran Phuoc Duy........................ 16, 92

Tran Quoc Dat .......................... 10, 62

Tran Thai Hoa..................... 17, 35, 40

Tran Thi Hai .............................. 18, 50

Tran Thi Thu Hanh.................... 22, 96

Tran Thi Thu Huong.................... 9, 55

Tran Thi Thuy Nu...................... 16, 94

Tran Thien Lan ..................... 8, 21, 98

Tran Thoai Duy Bao ................. 14, 42

Trieu Quynh Trang ..................... 8, 40

Trinh Van Mung ...................... 22, 100

Trinh Xuan Hoang ...... 14, 16, 45, 103

Truong Minh Duc .......... 11, 12, 81, 85

Truong Van Tuan...................... 19, 60

U. Hoefer .................................. 23, 43

V. V. Vien.................................. 16, 36

V.T Hoa .................................... 10, 49

Vo Phuoc Huy........................... 20, 76

Vo Thanh Lam .......................... 19, 52

Vo Van Hoang .............. 16, 22, 92, 96

Vo Van On ................................ 17, 39

Vo Van Tai................................ 19, 57

Vu Kim Thai .............................. 19, 57

Vu Ngoc Sau .... 11, 12, 21, 74, 82, 84

Vu Ngoc Tuoc................. 9, 12, 58, 99

Vu Thi Hai Yen ........... 16, 22, 36, 104

Vu Thu Huong ........................ 21, 103

Vu Van Hung10, 15, 19, 20, 25, 61, 63, 64, 66, 93

Vu Van Khai.............................. 16, 94

Vu Xuan Bach........................... 17, 33

Vu Xuan Chung .......................... 8, 34

Vuong Huu Tan ........................ 17, 39

Vy Thi Ha My .......................... 21, 103

Wieslaw Leoński................. 11, 86, 88


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