Thermodynamic Stability and Effects of Bose–Bose Repulsion in an Ultracold Bose–Fermi Mixture with Strong Hetero-Pairing Fluctuations

Koki Manabe, Yoji Ohashi

研究成果: Article査読

抄録

We theoretically investigate the thermodynamic stability of an ultracold Bose–Fermi mixture with a tunable inter-species interaction associated with a hetero-nuclear Feshbach resonance. To include hetero-pairing fluctuations, we employ an improved T-matrix approximation (iTMA), where all Bose Green’s functions involved in the self-energy are modified so as to satisfy the required gapless Bose excitations at the BEC phase transition. Using iTMA, we evaluate the compressibility matrix in the normal state, to examine the stability of the system against an effective Bose–Bose attraction, mediated by Fermi atoms. We clarify how the mechanical collapse of a Bose–Fermi mixture can be avoided by a direct Bose–Bose repulsive interaction. We also show that this thermodynamic instability cannot be captured by the ordinary non-self-consistent TMA, where the bare Bose Green’s function is used in the self-energy.Since the thermodynamic stability is crucial for the experimental realization of a resonant Bose–Fermi mixture, our results would contribute to the research for many-body properties of this system.

本文言語English
ページ(範囲)65-72
ページ数8
ジャーナルJournal of Low Temperature Physics
201
1-2
DOI
出版ステータスPublished - 2020 10月 1

ASJC Scopus subject areas

  • 原子分子物理学および光学
  • 材料科学一般
  • 凝縮系物理学

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