Non-Magnetic Impurity induced in-gap bound states in two band s_± superconductors

2009/06/13 by Ng, T. K., Avishai, Y.
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)

paper · doi:10.48550/arxiv.0906.2442

Abstract

In this paper we study the effect of single non-magnetic impurity in two-band s-wave superconductors where the two s-wave order parameters have relative phase δ≠0 between them. We show that in-gap bound states are always induced by non-magnetic impurities when δ=π (s_±-wave superconductors). The bound state is a consequence of the topological nature of the corresponding Bogoliubov-de Gennes equation.

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