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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: |
1 Apr 2004 | | Journal: | Phys. Rev. Lett. 93, 190403 (2004). DOI: 10.1103/PhysRevLett.93.190403 | | Subject: | Statistical Mechanics | cond-mat.stat-mech | | 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 non-monotonic behavior in the crossover region and are in quantitative agreement with current measurements of the transverse breathing mode by Kinast {it et al.} [Phys. Rev. Lett. {f 92}, 150402 (2004)] and of the axial breathing mode by Bartenstein {it et al.} [Phys. Rev. Lett. {f 92}, 203201 (2004)]. | | Source: | arXiv, cond-mat/0404012 | | Other source: | [GID 613426] pmid15600814 | | Services: | Forum | Review | PDF | Favorites | |
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