Multiple scattering theory for superconducting heterostructures

Gábor Csire, Balázs Újfalussy, József Cserti, Balázs Gyorffy

Research output: Contribution to journalArticle (Academic Journal)

11 Citations (Scopus)

Abstract

We generalize the screened Korringa-Kohn-Rostoker method for solving the corresponding Kohn-Sham-Bogoliubov-de Gennes equations for surfaces and interfaces. As an application of the theory, we study the quasiparticle spectrum of Au overlayers on a Nb(100) host. We find that within the superconducting gap region, the quasiparticle spectrum consists of Andreev bound states with a dispersion which is closely connected to the underlying electronic structure of the overlayer. We also find that the spectrum has a strongly k-dependent induced gap. The properties of the gap are discussed in relation to the thickness of the overlayer, and it is shown that certain states do not participate in the Andreev scattering process.

Original languageEnglish
Article number165142
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number16
DOIs
Publication statusPublished - 30 Apr 2015

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