caa a22 4500 445366516 CHVBK 20180317142932.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s10909-011-0397-2 doi (NATIONALLICENCE)springer-10.1007/s10909-011-0397-2 Pair Excitations and Parameters of State of Imbalanced Fermi Gases at Finite Temperatures [Elektronische Daten] [S. Klimin, J. Tempere, Jeroen Devreese] 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. Springer Science+Business Media, LLC, 2011 Quantum gases nationallicence Imbalance nationallicence Thermodynamics nationallicence Pair excitations nationallicence Klimin S. Theorie van Kwantumsystemen en Complexe Systemen, Universiteit Antwerpen, Universiteitsplein 1, 2610, Antwerpen, Belgium aut Tempere J. Theorie van Kwantumsystemen en Complexe Systemen, Universiteit Antwerpen, Universiteitsplein 1, 2610, Antwerpen, Belgium aut Devreese Jeroen Theorie van Kwantumsystemen en Complexe Systemen, Universiteit Antwerpen, Universiteitsplein 1, 2610, Antwerpen, Belgium aut Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 165/5-6(2011-12-01), 261-274 0022-2291 165:5-6<261 2011 165 10909 https://doi.org/10.1007/s10909-011-0397-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10909-011-0397-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Klimin S. Theorie van Kwantumsystemen en Complexe Systemen, Universiteit Antwerpen, Universiteitsplein 1, 2610, Antwerpen, Belgium aut NATIONALLICENCE 700 1- Tempere J. Theorie van Kwantumsystemen en Complexe Systemen, Universiteit Antwerpen, Universiteitsplein 1, 2610, Antwerpen, Belgium aut NATIONALLICENCE 700 1- Devreese Jeroen Theorie van Kwantumsystemen en Complexe Systemen, Universiteit Antwerpen, Universiteitsplein 1, 2610, Antwerpen, Belgium aut NATIONALLICENCE 773 0- Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 165/5-6(2011-12-01), 261-274 0022-2291 165:5-6<261 2011 165 10909 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer