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- Publisher
- Springer Journals
- Copyright
- Copyright © 2011 by Springer Science+Business Media, LLC
- Subject
- Physics; Condensed Matter Physics; Magnetism, Magnetic Materials; Characterization and Evaluation of Materials
- ISSN
- 0022-2291
- eISSN
- 1573-7357
- DOI
- 10.1007/s10909-011-0397-2
- Publisher site
- See Article on Publisher Site
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.
Journal
Journal of Low Temperature Physics – Springer Journals
Published: Sep 22, 2011