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:
Journal Article
Journal or Publication Title:
Physical review B
Uncontrolled Keywords:
/dk/atira/pure/researchoutput/libraryofcongress/qc
Subjects:
?? QC PHYSICS ??
ID Code:
11188
Deposited By:
Deposited On:
05 Aug 2008 08:55
Refereed?:
Yes
Published?:
Published
Last Modified:
28 Mar 2024 00:35