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Title: Superfluid stability in the BEC-BCS crossover

Abstract

We consider a dilute atomic gas of two species of fermions with unequal concentrations under a Feshbach resonance. We find that the system can have distinct properties due to the unbound fermions. The uniform state is stable only when either (a) beyond a critical coupling strength, where it is a gapless superfluid, or (b) when the coupling strength is sufficiently weak, where it is a normal Fermi gas mixture. Phase transition(s) must therefore occur when the resonance is crossed, in contrast to the equal population case where a smooth crossover takes place.

Authors:
; ;  [1];  [2]
  1. Department of Physics, National Chung Cheng University, Chiayi 621, Taiwan (China)
  2. (China)
Publication Date:
OSTI Identifier:
20788034
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 73; Journal Issue: 13; Other Information: DOI: 10.1103/PhysRevB.73.132506; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BCS THEORY; BOSE-EINSTEIN CONDENSATION; COUPLING; FERMI GAS; FERMIONS; MIXTURES; PHASE TRANSFORMATIONS; RESONANCE; STABILITY; SUPERFLUIDITY

Citation Formats

Pao, C.-H., Wu, S.-T., Yip, S.-K., and Institute of Physics, Academia Sinica, Nankang, Taipei 115, Taiwan. Superfluid stability in the BEC-BCS crossover. United States: N. p., 2006. Web. doi:10.1103/PHYSREVB.73.1.
Pao, C.-H., Wu, S.-T., Yip, S.-K., & Institute of Physics, Academia Sinica, Nankang, Taipei 115, Taiwan. Superfluid stability in the BEC-BCS crossover. United States. doi:10.1103/PHYSREVB.73.1.
Pao, C.-H., Wu, S.-T., Yip, S.-K., and Institute of Physics, Academia Sinica, Nankang, Taipei 115, Taiwan. Sat . "Superfluid stability in the BEC-BCS crossover". United States. doi:10.1103/PHYSREVB.73.1.
@article{osti_20788034,
title = {Superfluid stability in the BEC-BCS crossover},
author = {Pao, C.-H. and Wu, S.-T. and Yip, S.-K. and Institute of Physics, Academia Sinica, Nankang, Taipei 115, Taiwan},
abstractNote = {We consider a dilute atomic gas of two species of fermions with unequal concentrations under a Feshbach resonance. We find that the system can have distinct properties due to the unbound fermions. The uniform state is stable only when either (a) beyond a critical coupling strength, where it is a gapless superfluid, or (b) when the coupling strength is sufficiently weak, where it is a normal Fermi gas mixture. Phase transition(s) must therefore occur when the resonance is crossed, in contrast to the equal population case where a smooth crossover takes place.},
doi = {10.1103/PHYSREVB.73.1},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 13,
volume = 73,
place = {United States},
year = {Sat Apr 01 00:00:00 EST 2006},
month = {Sat Apr 01 00:00:00 EST 2006}
}