Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 14: Superconductivity: (General) Theory

TT 14.5: Vortrag

Montag, 7. März 2016, 16:00–16:15, H19

First-principles approach for superconducting slabs and heterostructures — •Gabor Csire — Wigner Research Centre for Physics, Budapest, Hungary

We present a fully ab-initio method to calculate the transition temperature for superconducting slabs and heterostuctures.

In the case of thin superconductor layers the electron-phonon interaction may change significantly. Therefore we calculate the layer dependent phonon spectrum to determine the layer dependence of the electron-phonon coupling for such systems. The phonon spectrum is than coupled to the Kohn-Sham-Bogoliubov-de Gennes equation via the McMillan-Hopfield parameter, and it is solved self-consistently.

The theory is applied to niobium slabs and niobium-gold heterostructures. Based on these calculations we investigate both the dependence of the superconducting transition temperature on the thickness of superconducting slabs and the inverse proximity effect observed in thin superconducting heterostructures.