Generic Phase Diagram of Fermion Superfluids with Population Imbalance

Journal Article · Fri Sep 22 04:00:00 EDT 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.97.120407· OSTI ID:20860841

Machida, K; Mizushima, T; Ichioka, M ^[1]

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1. Department of Physics, Okayama University, Okayama 700-8530 (Japan)

It is shown by microscopic calculations for trapped imbalanced Fermi superfluids that the gap function always has sign changes, i.e., the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO)-like state, up to a critical imbalance P{sub c}, beyond which normal state becomes stable, at temperature T=0. A temperature-versus-pressure phase diagram is constructed, where the BCS state without sign change is stable only at T{ne}0. We reproduce the observed bimodality in the density profile to identify its origin and evaluate P{sub c} as functions of T and the coupling strength. These dependencies match with the recent experiments.

• OSTI ID: 20860841
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 12 Vol. 97; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DENSITY
FERMI GAS
FERMIONS
PHASE DIAGRAMS
SUPERFLUIDITY
TRAPPING