Title
Pair excitations and parameters of state of imbalanced Fermi gases at finite temperatures Pair excitations and parameters of state of imbalanced Fermi gases at finite temperatures
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
New York ,
Subject
Physics
Source (journal)
Journal of low temperature physics. - New York
Volume/pages
165(2011) :5/6 , p. 261-274
ISSN
0022-2291
ISI
000298333500008
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The spectra of low-lying pair excitations for an imbalanced two-component superfluid Fermi gas are analytically derived within the path-integral formalism taking into account Gaussian fluctuations about the saddle point. The spectra are obtained for nonzero temperatures, both with and without imbalance, and for arbitrary interaction strength. On the basis of the pair excitation spectrum, we have calculated the thermodynamic parameters of state of cold fermions and the first and second sound velocities. The parameters of pair excitations show a remarkable agreement with the Monte Carlo data and with experiment.
E-info
https://repository.uantwerpen.be/docman/iruaauth/0655dc/24820f75963.pdf
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