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.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 9 Sep 2009|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics