Superfluid stability in the BEC-BCS crossover

Journal Article · Sat Apr 01 00:00:00 EST 2006 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.73.1· OSTI ID:20788034

Pao, C -H; Wu, S -T; Yip, S -K ^[1]

---

1. Department of Physics, National Chung Cheng University, Chiayi 621, Taiwan (China)

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.

• OSTI ID: 20788034
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 73, Issue 13; Other Information: DOI: 10.1103/PhysRevB.73.132506; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

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