Collective excitations of a degenerate gas at the BEC-BCS crossover

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dc.creatorBartenstein, M.
dc.creatorAltmeyer, A.
dc.creatorRiedl, S.
dc.creatorJochim, S.
dc.creatorChin, C.
dc.creatorDenschlag, J. Hecker
dc.creatorGrimm, R.
dc.date2004-03-29
dc.date2004-05-09
dc.date.accessioned2026-07-07T02:57:20Z
dc.date.available2026-07-07T02:57:20Z
dc.descriptionWe study collective excitation modes of a fermionic gas of $^6$Li atoms in the BEC-BCS crossover regime. While measurements of the axial compression mode in the cigar-shaped trap close to a Feshbach resonance confirm theoretical expectations, the radial compression mode shows surprising features. In the strongly interacting molecular BEC regime we observe a negative frequency shift with increasing coupling strength. In the regime of a strongly interacting Fermi gas, an abrupt change in the collective excitation frequency occurs, which may be a signature for a transition from a superfluid to a collisionless phase.
dc.descriptionFeshbach resonance position updated, few minor changes
dc.identifierhttps://arxiv.org/abs/cond-mat/0403716
dc.identifierhttp://arxiv.org/abs/cond-mat/0403716
dc.identifierPhys. Rev. Lett. 92, 203201 (2004)
dc.identifierdoi:10.1103/PhysRevLett.92.203201
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/23631
dc.subjectOther Condensed Matter
dc.titleCollective excitations of a degenerate gas at the BEC-BCS crossover
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