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Phys. Rev. B 74, 024516 (2006) [12 pages]

Fermion Cooper pairing with unequal masses: Standard field theory approach

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

Received 28 March 2006; revised 5 April 2006; published 24 July 2006

FermionCooper pairing with unequal masses is investigated in a standardfield theory approach. We derived the superfluid density and Meissnermass squared of the U(1) gauge field in a generaltwo-species model and found that the often used proportional relationbetween the two quantities is broken when the fermion massesare unequal. In the weak-coupling region, the superfluid density isalways negative but the Meissner mass squared becomes mostly positivewhen the mass ratio between the pairing fermions is largeenough. We established a proper momentum configuration of the LOFFpairing with unequal masses and showed that the LOFF stateis energetically favored due to the negative superfluid density. Thesingle-plane-wave LOFF state is physically equivalent to an anisotropic statewith a spontaneously generated superflow. The extension to a finite-rangeinteraction is briefly discussed.

©2006 The American Physical Society

URL:	http://link.aps.org/doi/10.1103/PhysRevB.74.024516
DOI:	10.1103/PhysRevB.74.024516
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:	fermion systems, superfluidity, Cooper pairs, Meissner effect

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P. Fulde and R. A. Ferrell, Phys. Rev. 135, A550 (1964).
A. Sedrakian and U. Lombardo, Phys. Rev. Lett. 84, 602 (2000).
M. Huang, P. Zhuang, and W. Chao, Phys. Rev. D 67, 065015 (2003).
W. V. Liu and F. Wilczek, Phys. Rev. Lett. 90, 047002 (2003).
Michael McNeil Forbes, E. Gubankova, W. V. Liu, and F. Wilczek, Phys. Rev. Lett. 94, 017001 (2005).
C. H. Pao, S. T. Wu, and S. K. Yip, Phys. Rev. B 73, 132506 (2006).
S. T. Wu and S. Yip, Phys. Rev. A 67, 053603 (2003).
P. F. Bedaque, H. Caldas, and G. Rupak, Phys. Rev. Lett. 91, 247002 (2003).
H. Caldas, Phys. Rev. A 69, 063602 (2004).
M. Huang and I. A. Shovkovy, Phys. Rev. D 70, 051501(R) (2004).
M. Huang and I. A. Shovkovy, Phys. Rev. D 70, 094030 (2004).
K. Fukushima, Phys. Rev. D 72, 074002 (2005).
M. Huang, Phys. Rev. D 73, 045007 (2006).
E. V. Gorbar, M. Hashimoto, and V. A. Miransky, Phys. Rev. Lett. 96, 022005 (2006).
L. He, M. Jin, and P. Zhuang, Phys. Rev. B 73, 024511 (2006).
L. He, M. Jin, and P. Zhuang, Phys. Rev. B 73, 214527 (2006).
Hui Hu and Xia-Ji Liu, Phys. Rev. A 73, 051603(R) (2006).
K. Iida and G. Baym, Phys. Rev. D 65, 014022 (2002);

66, 014015 (2002)

E. Gubankova, E. G. Mishchenko, and F. Wilczek, Phys. Rev. Lett. 94, 110402 (2005).
L. He, M. Jin, and P. Zhuang, Phys. Rev. B 73, 220504(R) (2006).

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