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In-gap bound states induced by nonmagnetic impurities in two-band s± superconductors

Authors Ng, Tai Kai View this author's profile
Avishai, Yshai HKUST affiliated (currently or previously).
Issue Date 2009
Source Physical Review B , v. 80, (10), September 2009, article number 104504
Summary 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.
ISSN 1098-0121
Rights © 2009 American Physical Society
Language English
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