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Phys. Rev. B 73, 214527 (2006) [12 pages]

LOFF pairing vs breached pairing in asymmetric fermion superfluids

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Lianyi He, Meng Jin, and Pengfei Zhuang
Physics Department, Tsinghua University, Beijing 100084, China

Received 9 January 2006; revised 11 May 2006; published 29 June 2006

Ageneral analysis for the competition between breached pairing (BP) andLOFF pairing mechanisms in asymmetric fermion superfluids is presented inthe frame of a four fermion interaction model. Two physicalconditions which can induce mismatched Fermi surfaces are considered: (1)fixed chemical potential asymmetry delta µ and (2) fixed fermion numberasymmetry alpha . In case (1), the BP state is ruledout because of Sarma instability, and the LOFF state isthermodynamically stable in a narrow window of delta µ. In case(2), while the Sarma instability can be avoided and boththe BP and LOFF states can survive provided alpha isless than the corresponding critical value, the BP state suffersmagnetic instability and the LOFF state is always thermodynamically stable.While the LOFF window in case (2) is much largerthan the one in the conventional case (1), the longitudinalsuperfluid density of the LOFF state is negative for small alpha and it suffers magnetic instability too.

©2006 The American Physical Society

URL:	http://link.aps.org/doi/10.1103/PhysRevB.73.214527
DOI:	10.1103/PhysRevB.73.214527
PACS:	13.60.Rj; 11.10.Wx; 25.75.-q 13.60.Rj Baryon production in photon/lepton-hadron interactions 11.10.Wx Finite-temperature field theory 25.75.-q Relativistic heavy-ion collisions YEAR: 2006
KEYWORDS:	superfluidity, Fermi surface, fermion systems, ground states

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