Superfluid stability in BEC-BCS crossover
Superconductivity
2009-11-11 v1 Statistical Mechanics
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.
Cite
@article{arxiv.cond-mat/0506437,
title = {Superfluid stability in BEC-BCS crossover},
author = {C. -H. Pao and Shin-Tza Wu and S. -K. Yip},
journal= {arXiv preprint arXiv:cond-mat/0506437},
year = {2009}
}
Comments
4 pages, 4 figures