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Generalized Galitskii approach for the vertex function of a Fermi gas with resonant interaction.

Vagov, A. and Schomerus, Henning and Shanenko, A. (2007) Generalized Galitskii approach for the vertex function of a Fermi gas with resonant interaction. Physical Review B, 76. p. 214513. ISSN 1550-235X

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    Abstract

    We present a generalized Galitskii approach for the Bethe-Salpeter equation for the two-particle vertex function of a Fermi system with the resonant interaction by accounting for the resonant state in the scattering potential and utilizing the universal form of the resonant scattering amplitude. The procedure can be carried out both for the normal as well as for the condensate state. In both cases, the vertex function in the vicinity of the resonance is shown to formally coincide with that obtained for a weakly attractive Fermi gas. Thus we justify the popular calculational framework in which results for the weakly attractive Fermi gas are formally extrapolated into the domain of strong coupling, and further to the repulsive side of the resonance, where molecular states are formed.

    Item Type: Article
    Journal or Publication Title: Physical Review B
    Subjects: Q Science > QC Physics
    Departments: Faculty of Science and Technology > Physics
    ID Code: 11188
    Deposited By: Dr Henning Schomerus
    Deposited On: 05 Aug 2008 09:55
    Refereed?: Yes
    Published?: Published
    Last Modified: 26 Jul 2012 14:58
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/11188

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