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Multiple scattering theory for superconducting heterostructures

We generalize the screened Korringa-Kohn-Rostoker (SKKR) method for solving the corresponding Kohn-Sham-Bogoliubov-de Gennes (KSBdG) equations for surfaces and interfaces. As an application of the newly developed 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 (ABS) 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 is discussed in relation to the thickness of the overlayer, and it is shown that certain states do not participate in the Andreev scattering process.

preprint2015arXivOpen access
Gábor CsireBalázs ÚjfalussyJózsef CsertiBalázs Győrffy
cond-mat.supr-con
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Open access4 authors1 topic
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Gábor CsireBalázs ÚjfalussyJózsef CsertiBalázs Győrffy

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