In-gap bound states induced by nonmagnetic impurities in two-band s± superconductors
T. K. Ng, Y. Avishai
DOI 10.1103/PhysRevB.80.104504 · Physical Review B
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Abstract
The physics of single nonmagnetic impurity immersed in a two-band s-wave superconductor with relative phase δ≠0 between its two order parameters is studied and elucidated. It is shown that midgap bound states are always induced by nonmagnetic impurities when δ=π (s±-wave superconductors). These bound states emerge as a consequence of the topological nature of the corresponding Bogoliubov-de Gennes equation.
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