Fulde-Ferrell-Larkin-Ovchinnikov State in the absence of a Magnetic Field

Details Fulde-Ferrell-Larkin-Ovchinnikov State in the absence of a Magnetic Field Fulde-Ferrell-Larkin-Ovchinnikov State in the absence of a Magnetic Field

2008-04-07

arxiv.org/abs/0804.1011v1

J. Phys. Soc. Jpn. 77, 043702 (2008)

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

10.1143/JPSJ.77.043702

We propose that in a system with pocket Fermi surfaces, a pairing state with a finite total momentum q_tot like the Fulde-Ferrell-Larkin-Ovchinnikov state can be stabilized even without a magnetic field. When a pair is composed of electrons on a pocket Fermi surface whose center is not located at Gamma point, the pair inevitably has finite q_tot. To investigate this possibility, we consider a two-orbital model on a square lattice that can realize pocket Fermi surfaces and we apply fluctuation exchange approximation. Then, by changing the electron number n per site, we indeed find that such superconducting states with finite q_tot are stabilized when the system has pocket Fermi surfaces.

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