Excitations in the BCS-BEC crossover regime of a superfluid Fermi gas with a Feshbach resonance

研究成果: Article査読

抄録

We investigate single-particle excitations at T = 0 in the BCS-BEC crossover regime of a superfluid Fermi gas. We solve the Bogoliubov-de Gennes equations in a trap, including a tunable pairing interaction associated with a Feshbach resonance. We show that the single-particle energy gap Eg is dominated by the lowest-energy Andreev bound state localized at the surface of the gas, which is much smaller than the superfluid order parameter over(Δ, ̃) (r = 0) at the center of the trap. We also calculate the rf-tunneling current spectrum IF(ω). In a broad Feshbach resonance, the peak energy in IF(ω) is shown to give, not Eg, but over(Δ, ̃) (r = 0). In a narrow resonance, significant spectral weight coming from the low-energy Andreev states hides the appearance of the peak in IF(ω) at ω ≃ over(Δ, ̃) (r = 0). Our results for a broad resonance is in good agreement with the recent rf-tunneling measurement in a superfluid 6Li.

本文言語English
ページ(範囲)234-238
ページ数5
ジャーナルPhysica C: Superconductivity and its applications
437-438
SPEC. ISS.
DOI
出版ステータスPublished - 2006 5 15
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 電子工学および電気工学

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