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Pseudogap in Fermionic Density of States in the BCS-BEC Crossover of Atomic Fermi Gases.
- Source :
-
Journal of Low Temperature Physics . Jan2010, Vol. 158 Issue 1/2, p29-35. 7p. 4 Graphs. - Publication Year :
- 2010
-
Abstract
- Abstract  We study pseudogap behaviors of ultracold Fermi gases in the BCS-BEC crossover region. We calculate the density of states (DOS), as well as the single-particle spectral weight, above the superfluid transition temperature T c including pairing fluctuations within a T-matrix approximation. We find that DOS exhibits a pseudogap structure in the BCS-BEC crossover region, which is most remarkable near the unitarity limit. We determine the pseudogap temperature T * at which the pseudogap structure in DOS disappears. We also introduce another temperature T ** at which the BCS-like double-peak structure disappears in the spectral weight. While one finds T *>T ** in the BCS regime, T ** becomes higher than T * in the crossover and BEC regime. We also determine the pseudogap region in the phase diagram in terms of temperature and pairing interaction. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00222291
- Volume :
- 158
- Issue :
- 1/2
- Database :
- Academic Search Index
- Journal :
- Journal of Low Temperature Physics
- Publication Type :
- Academic Journal
- Accession number :
- 47274470