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Collective modes and ballistic expansion of a fermi gas in the BCS-BEC crossover | Hui Hu
; A Minguzzi
; Xia-Ji Liu
; M P Tosi
; | Date: |
5 Nov 2004 | Journal: | Phys Rev Lett, 93 (19), 190403 | Abstract: | We evaluate the frequencies of collective modes and the anisotropic expansion rate of a harmonically trapped Fermi superfluid at varying coupling strengths across a Feshbach resonance driving a BCS-BEC crossover. The equations of motion for the superfluid are obtained from a microscopic mean-field expression for the compressibility and are solved within a scaling ansatz. Our results confirm nonmonotonic behavior in the crossover region and are in quantitative agreement with current measurements of the transverse breathing mode by Kinast et al. [Phys. Rev. Lett. 92, 150402 (2004)]] and of the axial breathing mode by Bartenstein et al. [Phys. Rev. Lett. 92, 203201 (2004)]]. | Source: | PubMed, pmid15600814 | Other source: | [GID 613426] cond-mat/0404012 | Services: | Forum | Review | Favorites |
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