Fulde-Ferrell-Larkin-Ovchinnikov State in the absence of a Magnetic Field
Abstract
We propose that in a system with pocket Fermi surfaces, a pairing state with a finite total momentum qtot 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 qtot. 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 qtot are stabilized when the system has pocket Fermi surfaces.
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