caa a22 4500 445365749 CHVBK 20180317142929.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s10909-010-0309-x doi (NATIONALLICENCE)springer-10.1007/s10909-010-0309-x Fluctuation Spectral Functions and Phase Transitions for Cold Fermi Gases in2D [Elektronische Daten] [S. Klimin, J. Tempere] 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. Springer Science+Business Media, LLC, 2010 Quantum gases nationallicence Imbalance nationallicence BKT transition nationallicence Low dimensions nationallicence Klimin S. TQC, Universiteit Antwerpen, Universiteitsplein 1, 2610, Antwerpen, Belgium aut Tempere J. TQC, Universiteit Antwerpen, Universiteitsplein 1, 2610, Antwerpen, Belgium aut Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/3-4(2011-02-01), 291-298 0022-2291 162:3-4<291 2011 162 10909 https://doi.org/10.1007/s10909-010-0309-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10909-010-0309-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Klimin S. TQC, Universiteit Antwerpen, Universiteitsplein 1, 2610, Antwerpen, Belgium aut NATIONALLICENCE 700 1- Tempere J. TQC, Universiteit Antwerpen, Universiteitsplein 1, 2610, Antwerpen, Belgium aut NATIONALLICENCE 773 0- Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/3-4(2011-02-01), 291-298 0022-2291 162:3-4<291 2011 162 10909 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer