Pairing in asymmetrical Fermi systems with intra- and interspecies correlations

Journal Article · Sat Dec 01 04:00:00 EST 2007 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.76.212502· OSTI ID:21052797

Renyuan, Liao; Quader, Khandker F ^[1]

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1. Department of Physics, Kent State University, Kent, Ohio 44242 (United States)

We explore ground states of asymmetrical Fermi systems where both inter- (g{sub o}) and intra- (g{sub 1}) species pairing interactions are present. Using the equation of motion method, we obtain coupled mean-field equations for superfluid gap functions and population densities. We construct a phase diagram across BCS-BEC regimes. At low polarizations P, we find stable superfluid phases on BCS and BCS sides of unitarity for g{sub 1}>g{sub 1}{sup c}, a critical value, for a given g{sub o}. For larger P, we find phase separations in both regimes. A superfluid phase exists for all polarizations deep in the BEC regime. Our results should apply to a broad range of Fermi systems.

• OSTI ID: 21052797
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 21 Vol. 76; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BCS THEORY
BOSE-EINSTEIN CONDENSATION
CORRELATIONS
EQUATIONS OF MOTION
FERMIONS
GROUND STATES
HELIUM 3
MEAN-FIELD THEORY
PAIRING INTERACTIONS
PHASE DIAGRAMS
POLARIZATION
POPULATION DENSITY
SUPERFLUIDITY