Fulde-Ferrell-Larkin-Ovchinnikov state in disordered s-wave superconductors - Condensed Matter > SuperconductivityReport as inadecuate




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Abstract: The Fulde-Ferrell-Larkin-Ovchinnikov FFLO state is a superconducting statestabilized by a large Zeeman splitting between up- and down-spin electrons in asinglet superconductor. In the absence of disorder, the superconducting orderparameter has a periodic spatial structure, with periodicity determined by theZeeman splitting. Using the Bogoliubov-de Gennes BdG approach, we investigatethe spatial profiles of the order parameters of FFLO states in atwo-dimensional s-wave superconductors with nonmagnetic impurities. The FFLOstate is found to survive under moderate disorder strength, and the orderparameter structure remains approximately periodic. The actual structure of theorder parameter depends on not only the Zeeman field, but also the disorderstrength and in particular the specific disorder configuration.



Author: Qinghong Cui, Kun Yang

Source: https://arxiv.org/







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