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Magnetic Properties and Strong-Coupling Corrections in an Ultracold Fermi Gas with Population Imbalance.
- Source :
-
Journal of Low Temperature Physics . May2013, Vol. 171 Issue 3/4, p355-361. 7p. - Publication Year :
- 2013
-
Abstract
- We investigate magnetic properties of an ultracold Fermi gas with population imbalance. In the presence of population imbalance, the strong-coupling theory developed by Nozières and Schmitt-Rink (which is frequently referred to as the NSR theory, or Gaussian fluctuation theory) is known to give unphysical results in the BCS-BEC crossover region. We point out that this problem comes from how to treat pseudogap effects originating from pairing fluctuations and many-body corrections to the spin susceptibility. We also clarify how to overcome this problem by including higher order fluctuations beyond the ordinary T-matrix approximation. Calculated spin susceptibility based on our extended T-matrix approximation agrees well with the recent experiment on a Li Fermi gas. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00222291
- Volume :
- 171
- Issue :
- 3/4
- Database :
- Academic Search Index
- Journal :
- Journal of Low Temperature Physics
- Publication Type :
- Academic Journal
- Accession number :
- 86401138
- Full Text :
- https://doi.org/10.1007/s10909-012-0724-2