Superfluid stability in the BEC-BCS crossover

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C.-H. Pao and Shin-Tza Wu
Department of Physics, National Chung Cheng University, Chiayi 621, Taiwan

S.-K. Yip
Institute of Physics, Academia Sinica, Nankang, Taipei 115, Taiwan

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Received 13 June 2005; published 19 April 2006

Weconsider a dilute atomic gas of two species of fermionswith unequal concentrations under a Feshbach resonance. We find thatthe system can have distinct properties due to the unboundfermions. The uniform state is stable only when either (a)beyond a critical coupling strength, where it is a gaplesssuperfluid, 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 contrastto the equal population case where a smooth crossover takesplace.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.73.132506
DOI:	10.1103/PhysRevB.73.132506
PACS:	03.75.Ss; 05.30.Fk; 34.90.+q 03.75.Ss Degenerate Fermi gases 05.30.Fk Fermion systems and electron gas (quantum statistical mechanics) 34.90.+q Other topics in atomic and molecular collision processes and interactions (restricted to new topics in section 34) YEAR: 2006
KEYWORDS:	superfluidity, Bose-Einstein condensation, BCS theory, resonant states, fermion systems, phase transformations

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Erratum

Erratum: Superfluid stability in the BEC-BCS crossover [Phys. Rev. B 73, 132506 (2006)]
C.-H. Pao, Shin-Tza Wu, and S.-K. Yip
Phys. Rev. B 74, 189901 (E) (2006)