Magnetic properties and strong-coupling corrections in an ultracold fermi gas with population imbalance

T. Kashimura, R. Watanabe, Y. Ohashi

研究成果: Article査読

5 被引用数 (Scopus)

抄録

We investigate magnetic properties of an ultracold Fermi gas with population imbalance. In the presence of population imbalance, the strong-coupling theory developed by Nozières and Schmitt-Rink (which is frequently referred to as the NSR theory, or Gaussian fluctuation theory) is known to give unphysical results in the BCS-BEC crossover region. We point out that this problem comes from how to treat pseudogap effects originating from pairing fluctuations and many-body corrections to the spin susceptibility. We also clarify how to overcome this problem by including higher order fluctuations beyond the ordinary T -matrix approximation. Calculated spin susceptibility based on our extended T -matrix approximation agrees well with the recent experiment on a 6Li Fermi gas.

本文言語English
ページ(範囲)355-361
ページ数7
ジャーナルJournal of Low Temperature Physics
171
3-4
DOI
出版ステータスPublished - 2013 5月

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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