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TT: Fachverband Tiefe Temperaturen
TT 5: Superconductivity: Properties and Electronic Structure I
TT 5.3: Talk
Monday, March 17, 2025, 10:00–10:15, H36
Ab-initio investigation of transition metal – superconductor interfaces — •Adamantia Kosma1, Stefan Blügel1, and Philipp Rüßmann1,2 — 1Peter Grünberg Institut, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany — 2Institute for Theoretical Physics and Astrophysics, University of Würzburg, 97074 Würzburg, Germany
The realisation of Majorana-based topologically protected qubits requires a careful design and optimization of material interfaces for superconductor (SC)/topological insulator (TI) heterostructures. To this end, we perform ab-initio simulations to investigate the superconducting properties at the interface of transition metal overlayers (M = Os, Ir, Pt, Au) deposited on a Nb(110) film. Our density functional theory calculations are based on the full-potential Korringa-Kohn-Rostoker (KKR) Green function method and its Kohn-Sham Bogoliubov-de Gennes (KS-BdG) extension [1,2]. In our study we explore the possibility to control the work function mismatch through the overlayer, and we uncover the proximity induced superconductivity. Our findings show that some of these structures might be promising material candidates for interfacing a TI with a superconductor without unwanted band bending effects at SC/M/TI interfaces.
We thank the ML4Q (EXC 2004/1 – 390534769) for funding.
[1] JuDFTteam/JuKKR (2022). doi: 10.5281/zenodo.7284738
[2] P. Rüßmann, and S. Blügel, Phys. Rev. B 105, 125143 (2022).
Keywords: Topological Superconductor; Proximity Effect; Density functional theory; Heterostructure; Bogoliubov-de Gennes method