Publication
Title
Fluctuation spectral functions and phase transitions for cold Fermi gases in 2D
Author
Abstract
We study cold fermions in 2D that are interacting through the s-wave contact potential, using the path-integral formalism. The phase transitions are investigated using the joint solution of the gap and number equations. In the latter ones, the amplitude and phase fluctuations are taken into account within the t-matrix NSR-type formalism. It is shown that convergent solutions for the fermion density in 2D can be obtained even in the lowest-order (quadratic) approximation for fluctuations with a proper determination of the spectral functions. This approach leads, in particular, to a non-coherent quasicondensate which exists between the Berezinskii-Kosterlitz-Thouless (BKT) transition temperature below which the system is superfluid and a transition temperature T Δ above which the quasicondensate is destroyed.
Language
English
Source (journal)
Journal of low temperature physics. - New York
Publication
New York : 2011
ISSN
0022-2291
Volume/pages
162:3/4(2011), p. 291-298
ISI
000286108200027
Full text (Publisher's DOI)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 12.01.2011
Last edited 21.06.2017
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