不純物で探る量子物質の性質 -...
TRANSCRIPT
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飯田 圭 (高知大学)
Contents
・ Impurity problems in dense matter
・ Nuclei in neutron matter
・ Light elements in hot dense matter
・ Polaron problems in trapped cold atoms
・ Conclusion
不純物で探る量子物質の性質Probing quantum matter with impurities
クラスター階層キックオフシンポジウム、 東工大、 Nov. 2018
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Pairing correlations and polarons in strong-force interacting many-body systems
By Fukushima
pp/ph
ph
pp
Cooper pairingOverhauser pairing
Fermi sphere - -+ +
2p/q
Q
Main slide in the first workshop
(March, 2017) in Osaka
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Pairing correlations and polarons in strong-force interacting many-body systems
By Fukushima
pp/ph
ph
pp
Q
Impurities (“clusters”) play a role
in probing the medium properties
heavy
nuclei
d, a,3He
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Neutron stars made of pp and/or ph condensates,
whose properties could be probed by impurities
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From R. Hulet
Typical examples of pp correlations: Neutron matter and trapped cold atoms
Low density neutron matter Cold Fermi atoms near Feshbach resonance
From M. Horikoshi
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.
From Lamb (1991).
Nuclear matter in neutron stars
Liquid-gas mixture Liquid
Schematic cross-section of a neutron star
)(cold K 10~ 9T
bcc BaTiO3-type
From Kobyakov and Pethick (2013, 2016).
crust
?
Internuclear interaction
via SF-phonon exchange,
e.g.,
Long-range Casimir-
Polder form (~1/r7)
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Hot dense matter
Core-collapse supernovae
From K. Sumiyoshi
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Hot dense matter (contd.)
Neutron star – neutron star mergers
From Coleman Miller
(Nature 551, 36 (2017))
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Light elements in hot dense matter
Schematic phase diagram
in dense stellar matterMass fractions of light elements
From S. Lalit et al., arXiv:1809.08126
Light elements in I contribute
significantly to entropy!
Mass fractions Xi obtained from
excluded volume effects (see also
Togashi EOS) are reliable?
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Light elements in hot dense matter (contd.) From S. Lalit et al., arXiv:1809.08126
Entropy per baryon
陽子(p)
α粒子
中性子(n)
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From M.-G. Hu et al., PRL 117 (2016) 055301.
Polaron problems in trapped cold atoms
Fermi atom-Bogoliubov phonon electron-phonon
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From M.-G. Hu et al., PRL 117 (2016) 055301.
Polaron problems in trapped cold atoms (contd.)
Fermi 40K impurity in a Bose 87Rb gas
Another version: impurity
atoms in a trapped Fermi gas
imbalanced mixtures of 6Li atoms
in the lowest two Zeeman states
From F. Scazza et al., PRL 118 (2017) 083602.
From K. Nishimura
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Polaron problems in exotic hadrons and trapped cold atoms
Lambda(1405)
Impurity Fermi atom in Bose condensates
From E. Nakano
From A. Dote
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Conclusion
Mass shift of a “cluster” &
“cluster”-”cluster” interactions
induced in medium
Good probe of the medium
properties, e.g., Fermi
degeneracy, superfluidity
By Fukushima
heavy
nuclei
d, a,3He
Q