Title
Phase correlations and quasicondensate in a two-dimensional ultracold Fermi gas Phase correlations and quasicondensate in a two-dimensional ultracold Fermi gas
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Amsterdam ,
Subject
Physics
Source (journal)
Journal of magnetism and magnetic materials. - Amsterdam
Volume/pages
376(2015) , p. 14-19
ISSN
0304-8853
ISI
000344950300003
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The interplay between dimensionality, coherence and interaction in superfluid Fermi gases is analyzed by the phase correlation function of the held of fermionic pairs. We calculate this phase correlation Function for a two-dimensional superfluid Fermi gas with s-wave interactions within the Gaussian pair Fluctuation formalism. The spatial behavior of the correlation function is shown to exhibit a rapid (exponential) decay at short distances and a characteristic algebraic decay at large distances, with an exponent matching that expected from the Berezinskii-Kosterlitz-Thouless theory of 20 Bose super-fluids. We conclude that the Gaussian pair fluctuation approximation is able to capture the physics of quasi-long-range order in two-dimensional Fermi gases. (C) 2014 Elsevier By. All rights reserved.
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https://repository.uantwerpen.be/docman/iruaauth/8d3d28/887122124.pdf
Full text (open access)
https://repository.uantwerpen.be/docman/irua/45e724/122124.pdf
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