Absence of BCS Condensation of Atoms in a Repulsive Fermi Gas of Atoms

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dc.creatorHan, Fuxiang
dc.creatorLi, Hailing
dc.creatorLei, Minghao
dc.creatorWu, E
dc.date2005-10-11
dc.date.accessioned2026-07-07T06:44:17Z
dc.date.available2026-07-07T06:44:17Z
dc.descriptionPossible Bose-Einstein condensation of molecules and Bardeen-Cooper-Schrieffer (BCS) condensation of Cooper pairs of atoms in an ultracold Fermi gas of atoms with a repulsive two-body interaction are studied by using the path integral representation of the grand partition function. From the self-consistent equations obtained in the present work for the order parameters, we have found that BCS condensation of atoms can't occur in such a Fermi gas of atoms and that the condensate observed experimentally is composed of condensed molecules or possibly of preformed Cooper pairs. To substantiate our conclusions from the self-consistent equations for the order parameters, the effective atom-atom interaction mediated through molecules has also been computed with the Foldy-Wouthuysen transformation and has been found to be repulsive, which implies a net repulsive two-body interaction between atoms and hence the absence of BCS condensation of atoms.
dc.description4 pages, no figure. Submitted to Phys. Rev. Lett
dc.identifierhttps://arxiv.org/abs/cond-mat/0510296
dc.identifierhttp://arxiv.org/abs/cond-mat/0510296
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/102733
dc.subjectOther Condensed Matter
dc.titleAbsence of BCS Condensation of Atoms in a Repulsive Fermi Gas of Atoms
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