BCS-BEC Crossover of a Quasi-two-dimensional Fermi Gas: the Significance of Dressed Molecules

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dc.creatorZhang, Wei
dc.creatorLin, G. -D.
dc.creatorDuan, L. -M.
dc.date2008-03-17
dc.date2008-08-06
dc.date.accessioned2026-07-07T09:54:39Z
dc.date.available2026-07-07T09:54:39Z
dc.descriptionWe study the crossover of a quasi-two-dimensional Fermi gas trapped in the radial plane from the Bardeen-Cooper-Schrieffer (BCS) regime to the Bose-Einstein condensation (BEC) regime by crossing a wide Feshbach resonance. We consider two effective two-dimensional Hamiltonians within the mean-field level, and calculate the zero-temperature cloud size and number density distribution. For a model 1 Hamiltonian with renormalized atom-atom interaction, we observe a constant cloud size for arbitrary detunings. For a model 2 Hamiltonian with renormalized interactions between atoms and dressed molecules, the cloud size deceases from the BCS to BEC side, which is consistent with the picture of BCS-BEC crossover. This qualitative discrepancy between the two models indicates that the inclusion of dressed molecules is essential for a mean-field description of quasi-two-dimensional Fermi systems, especially on the BEC side of the Feshbach resonance.
dc.description5 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/0803.2488
dc.identifierhttp://arxiv.org/abs/0803.2488
dc.identifierPhys. Rev. A 77, 063613 (2008)
dc.identifierdoi:10.1103/PhysRevA.77.063613
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/166397
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleBCS-BEC Crossover of a Quasi-two-dimensional Fermi Gas: the Significance of Dressed Molecules
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