Collective Excitations in Bose–Fermi Mixtures

Yoji Asano; Masato Narushima; Shohei Watabe; Tetsuro Nikuni

doi:10.1007/s10909-018-2105-y

Collective Excitations in Bose–Fermi Mixtures

Yoji Asano, Masato Narushima, Shohei Watabe, Tetsuro Nikuni

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

We investigate collective excitations of density fluctuations and a dynamic density structure factor in a mixture of Bose and Fermi gases in a normal phase. With decreasing temperature, we find that the frequency of the collective excitation deviates from that of the hydrodynamic sound mode. Even at a temperature much lower than the Fermi temperature, the collective mode frequency does not reach the collisionless limit analogous to zero sound in a Fermi gas, because of collisions between bosons and fermions.

Original language	English
Pages (from-to)	133-139
Number of pages	7
Journal	Journal of Low Temperature Physics
Volume	196
Issue number	1-2
DOIs	https://doi.org/10.1007/s10909-018-2105-y
Publication status	Published - 2019 Jul 15
Externally published	Yes

Keywords

Bose–Fermi mixture
Collective excitation
Dynamic structure factor
First sound
Normal state
Zero sound

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Materials Science(all)
Condensed Matter Physics

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10.1007/s10909-018-2105-y

Cite this

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title = "Collective Excitations in Bose–Fermi Mixtures",

abstract = "We investigate collective excitations of density fluctuations and a dynamic density structure factor in a mixture of Bose and Fermi gases in a normal phase. With decreasing temperature, we find that the frequency of the collective excitation deviates from that of the hydrodynamic sound mode. Even at a temperature much lower than the Fermi temperature, the collective mode frequency does not reach the collisionless limit analogous to zero sound in a Fermi gas, because of collisions between bosons and fermions.",

keywords = "Bose–Fermi mixture, Collective excitation, Dynamic structure factor, First sound, Normal state, Zero sound",

author = "Yoji Asano and Masato Narushima and Shohei Watabe and Tetsuro Nikuni",

note = "Funding Information: Acknowledgements We are grateful to Y. Iijima for discussion in the early stage of this work. S.W. is supported by JSPS KAKENHI Grant Nos. (JP16K17774, JP18K03499), and T.N. is supported by JSPS KAKENHI Grant No. (JP16K05504). Publisher Copyright: {\textcopyright} 2018, Springer Science+Business Media, LLC, part of Springer Nature.",

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AU - Asano, Yoji

AU - Narushima, Masato

AU - Watabe, Shohei

AU - Nikuni, Tetsuro

N1 - Funding Information: Acknowledgements We are grateful to Y. Iijima for discussion in the early stage of this work. S.W. is supported by JSPS KAKENHI Grant Nos. (JP16K17774, JP18K03499), and T.N. is supported by JSPS KAKENHI Grant No. (JP16K05504). Publisher Copyright: © 2018, Springer Science+Business Media, LLC, part of Springer Nature.

PY - 2019/7/15

Y1 - 2019/7/15

N2 - We investigate collective excitations of density fluctuations and a dynamic density structure factor in a mixture of Bose and Fermi gases in a normal phase. With decreasing temperature, we find that the frequency of the collective excitation deviates from that of the hydrodynamic sound mode. Even at a temperature much lower than the Fermi temperature, the collective mode frequency does not reach the collisionless limit analogous to zero sound in a Fermi gas, because of collisions between bosons and fermions.

AB - We investigate collective excitations of density fluctuations and a dynamic density structure factor in a mixture of Bose and Fermi gases in a normal phase. With decreasing temperature, we find that the frequency of the collective excitation deviates from that of the hydrodynamic sound mode. Even at a temperature much lower than the Fermi temperature, the collective mode frequency does not reach the collisionless limit analogous to zero sound in a Fermi gas, because of collisions between bosons and fermions.

KW - Bose–Fermi mixture

KW - Collective excitation

KW - Dynamic structure factor

KW - First sound

KW - Normal state

KW - Zero sound

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Collective Excitations in Bose–Fermi Mixtures

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Keywords

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