Superfluid density in the BCS-BEC crossover regime of a two-component Fermi gas at finite temperatures

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Abstract

We investigate the superfluid carrier density ρ s in the BCS-BEC crossover regime of a superfluid Fermi gas at finite temperatures. Including pairing fluctuations within the gaussian fluctuation approximation, we determine the superfluid order parameter Δ, Fermi chemical potential μ, as well as ρ s , in a consistent manner. In the weak-coupling regime, the normal fluid density ρ n ρ-ρ s is dominated by quasi-particle excitations associated with the dissociation of Cooper pairs. As one approaches the BCS-BEC crossover regime, effects of pairing fluctuations on ρ n become strong. In the strong-coupling BEC regime, ρ n is shown to be dominated by Bogoliubov phonon in a molecular Bose superfluid.

Original languageEnglish
Pages (from-to)609-612
Number of pages4
JournalJournal of Superconductivity and Novel Magnetism
Volume20
Issue number7-8
DOIs
Publication statusPublished - 2007 Nov 1

Keywords

  • BCS-BEC crossover
  • Feshbach resonance
  • Superfluid Fermi gas

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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