Fulde-Ferrell-Larkin-Ovchinnikov State in the Absence of a Magnetic Field(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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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 Γ 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.
- 社団法人日本物理学会の論文
- 2008-04-15
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関連論文
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