BCS-BEC crossover in an asymmetric two-component Fermi gas

Liu, X. J. and Hu, H. (2006) BCS-BEC crossover in an asymmetric two-component Fermi gas. Europhysics Letters, 75 3: 364-370. doi:10.1209/epl/i2006-10136-3


Author Liu, X. J.
Hu, H.
Title BCS-BEC crossover in an asymmetric two-component Fermi gas
Journal name Europhysics Letters   Check publisher's open access policy
ISSN 0295-5075
Publication date 2006
Sub-type Article (original research)
DOI 10.1209/epl/i2006-10136-3
Open Access Status Not Open Access
Volume 75
Issue 3
Start page 364
End page 370
Total pages 7
Place of publication Les Ulis, France
Publisher E D P Sciences
Collection year 2006
Language eng
Abstract We discuss the superfluid phase transition of a strongly interacting Fermi gas with unequal ( asymmetric) chemical potentials in two pairing hyperfine states, and map out its phase diagram near the BCS-BEC crossover. Our approach includes the fluctuation contributions of preformed Cooper pairs to the thermodynamic potential at finite temperature. We show that, below a critical difference in chemical potentials between species, a normal gas is unstable towards the formation of either a finite-momentum paired Fulde-Ferrell-Larkin-Ovchinnikov superconducting phase or a uniform superfluid, depending on the asymmetry and interaction strengths. We determine the value of critical chemical potential mismatch, and find that it is consistent with a recent measurement by Zwierlein et al. ( Science, 311 ( 2006) 492).
Keyword Physics, Multidisciplinary
Exchange Field
Superconductivity
Superfluidity
Condensation
Transition
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 09:50:16 EST