Superfluid phase transition and strong-coupling effects in an ultracold fermi gas with mass imbalance

R. Hanai, T. Kashimura, R. Watanabe, D. Inotani, Y. Ohashi

研究成果: Article査読

3 被引用数 (Scopus)

抄録

We investigate the superfluid phase transition and effects of mass imbalance in the BCS (Bardeen-Cooper-Schrieffer)-BEC (Bose-Einstein condensation) crossover regime of an cold Fermi gas.We point out that the Gaussian fluctuation theory developed by Nozières and Schmitt-Rink and the T -matrix theory, that are now widely used to study strong-coupling physics of cold Fermi gases, give unphysical results in the presence of mass imbalance. To overcome this problem, we extend the T -matrix theory to include higher-order pairing fluctuations. Using this, we examine how the mass imbalance affects the superfluid phase transition. Since the mass imbalance is an important key in various Fermi superfluids, such as 40K-6Li Fermi gas mixture, exciton condensate, and color superconductivity in a dense quark matter, our results would be useful for the study of these recently developing superfluid systems.

本文言語English
ページ(範囲)389-396
ページ数8
ジャーナルJournal of Low Temperature Physics
171
3-4
DOI
出版ステータスPublished - 2013 5

ASJC Scopus subject areas

  • 原子分子物理学および光学
  • 材料科学(全般)
  • 凝縮系物理学

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