Fulde-Ferrell-Larkin-Ovchinnikov state in disordered s-wave superconductors

Qinghong Cui; Kun Yang

doi:10.1103/PhysRevB.78.054501

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Fulde-Ferrell-Larkin-Ovchinnikov state in disordered s-wave superconductors

Qinghong Cui, Kun Yang

DOI 10.1103/PhysRevB.78.054501 · Physical Review B

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Abstract

The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state is a superconducting state stabilized by a large Zeeman splitting between up- and down-spin electrons in a singlet superconductor. In the absence of disorder, the superconducting order parameter has a periodic spatial structure, with periodicity determined by the Zeeman splitting. Using the Bogoliubov–de Gennes approach, we investigate the spatial profiles of the order parameters of FFLO states in a two-dimensional s-wave superconductors with nonmagnetic impurities. The FFLO state is found to survive under moderate disorder strength, and the order-parameter structure remains approximately periodic. The actual structure of the order-parameter depends on not only the Zeeman field but also the disorder strength and in particular the specific disorder configuration.