Spin-dipole mode in a trapped Fermi gas near unitarity

Hiroyuki Tajima, Alessio Recati, Yoji Ohashi

研究成果: Article査読

2 被引用数 (Scopus)


We theoretically investigate the spin-dipole oscillation of a strongly interacting Fermi gas confined by a harmonic trapping potential. By using a diagrammatic strong-coupling theory combined with a local density approximation and a sum rule approach, we study the temperature dependence of the spin-dipole frequency near unitarity. The connection of the spin-dipole frequency with the spin susceptibility and the pairing correlations is exploited. While the spin-dipole frequency exactly coincides with the trap frequency in a noninteracting Fermi gas, it is shown to be strongly enhanced in the superfluid state, because of the suppression of the spin degree of freedom due to the spin-singlet Cooper-pair formation. In strongly interacting Fermi gases, such enhancement occurs even above the superfluid phase transition temperature, due to the strong pairing correlations.

ジャーナルPhysical Review A
出版ステータスPublished - 2020 1月 13

ASJC Scopus subject areas

  • 原子分子物理学および光学


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