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arXiv 1502.00472cond-mat.supr-con
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超导异质结构的多重散射理论

Multiple scattering theory for superconducting heterostructures

Gábor Csire, Balázs Újfalussy, József Cserti, Balázs Győrffy

摘要:

我们推广的屏蔽Korringa-Kohn-Rostoker(SKKR)方法求解相应的Kohn-Sham-Bogoliubov-de Gennes(KSBdG)方程的表面和界面。作为新发展理论的一个应用,我们研究了Nb(100)基质上Au覆盖层的准粒子谱。我们发现,在超导能隙区域内,准粒子谱由Andreev束缚态(ABS)组成,其色散与覆盖层的底层电子结构密切相关。我们还发现,光谱有一个强烈的依赖于k的诱导间隙。的间隙的属性进行了讨论的覆盖层的厚度,它示出,某些状态不参与Andreev散射过程。

英文摘要:

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.

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