Superfluidity in a three-flavor Fermi gas with SU(3) symmetry

Journal Article · Fri Sep 15 04:00:00 EDT 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.74.033604· OSTI ID:20857732

Lianyi, He; Meng, Jin; Pengfei, Zhuang ^[1]

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1. Physics Department, Tsinghua University, Beijing 100084 (China)

We investigate the superfluidity and the associated Nambu-Goldstone modes in a three-flavor atomic Fermi gas with SU(3) global symmetry. The s-wave pairing occurs in flavor antitriplet channel due to the Pauli principle, and the superfluid state contains both gapped and gapless fermionic excitations. Corresponding to the spontaneous breaking of the SU(3) symmetry to a SU(2) symmetry with five broken generators, there are only three Nambu-Goldstone modes, one is with linear dispersion law and two are with quadratic dispersion law. The other two expected Nambu-Goldstone modes become massive with a mass gap of the order of the fermion energy gap in a wide coupling range. The abnormal number of Nambu-Goldstone modes, the quadratic dispersion law, and the mass gap have significant effect on the low-temperature thermodynamics of the matter.

• OSTI ID: 20857732
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 74; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
BCS THEORY
COUPLING
ENERGY GAP
EXCITATION
FERMI GAS
FERMIONS
FLAVOR MODEL
MASS
PAULI PRINCIPLE
S WAVES
SU-2 GROUPS
SU-3 GROUPS
SUPERFLUIDITY
SYMMETRY
SYMMETRY BREAKING
THERMODYNAMICS