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dc.contributor.authorOrtiz, G.-
dc.contributor.authorDukelsky, Jorge-
dc.identifier.citationPhysical Review A 72(4): 043611 (2005)en_US
dc.description5 pages, 1 table, 4 figures.--PACS nrs.: 03.75.Ss, 02.30.Ik, 05.30.Fk, 74.20.Fg.--Arxiv pre-print available at: http://arxiv.org/abs/cond-mat/0503664en_US
dc.description.abstractThe BCS-to-BEC crossover, as well as the nature of Cooper pairs, in superconducting and Fermi superfluid media is studied from the exact ground state wave function of the reduced BCS Hamiltonian. As the strength of the interaction increases, the ground state continuously evolves from a mixed system of quasifree fermions and pair resonances (BCS), to pair resonances and quasibound molecules (pseudogap), and finally to a system of quasibound molecules (BEC). A single unified scenario arises where the Cooper-pair wave function has a unique functional form. Several exact analytic expressions such as the binding energy and condensate fraction are derived. We compare our results with recent experiments in ultracold atomic Fermi gases.en_US
dc.description.sponsorshipWe acknowledge discussions with G. G. Dussel, J. Gubernatis, A. J. Leggett, D. Loss, G. Sierra, E. M. Timmermans, and S. A. Trugman. J.D. acknowledges financial support from the Spanish DGI under Grant No. BFM2003-05316-C02-02.en_US
dc.format.extent154009 bytes-
dc.publisherAmerican Physical Societyen_US
dc.subject[PACS] Degenerate Fermi gasesen_US
dc.subject[PACS] Integrable systemsen_US
dc.subject[PACS] Fermion systems and electron gasen_US
dc.subject[PACS] BCS theory and its developmenten_US
dc.titleBCS-to-BEC crossover from the exact BCS solutionen_US
dc.description.peerreviewedPeer revieweden_US
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