Collective modes and ballistic expansion of a Fermi gas in the BCS-BEC crossover

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dc.creatorHu, Hui
dc.creatorMinguzzi, A.
dc.creatorLiu, Xia-Ji
dc.creatorTosi, M. P.
dc.date2004-04-01
dc.date2004-10-26
dc.date.accessioned2026-07-07T02:57:23Z
dc.date.available2026-07-07T02:57:23Z
dc.descriptionWe 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. {\bf 92}, 150402 (2004)] and of the axial breathing mode by Bartenstein {\it et al.} [Phys. Rev. Lett. {\bf 92}, 203201 (2004)].
dc.description4 pages and 4 figures; proof version with more extensive discussions on the comparison between theoretical results and experimental findings; to appear in Phys. Rev. Lett. (Nov. 2004)
dc.identifierhttps://arxiv.org/abs/cond-mat/0404012
dc.identifierhttp://arxiv.org/abs/cond-mat/0404012
dc.identifierPhys. Rev. Lett. 93, 190403 (2004).
dc.identifierdoi:10.1103/PhysRevLett.93.190403
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/23648
dc.subjectStatistical Mechanics
dc.titleCollective modes and ballistic expansion of a Fermi gas in the BCS-BEC crossover
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