Multiple scattering theory for superconducting heterostructures
Abstract
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.
Cite
@article{arxiv.1502.00472,
title = {Multiple scattering theory for superconducting heterostructures},
author = {Gábor Csire and Balázs Újfalussy and József Cserti and Balázs Győrffy},
journal= {arXiv preprint arXiv:1502.00472},
year = {2016}
}
Comments
11 pages, 7 figures