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TT: Fachverband Tiefe Temperaturen
TT 46: Focus Session: Evolution of Topological Materials into Superconducting Nanodevices (joint session HL/TT)
TT 46.2: Talk
Wednesday, March 20, 2024, 12:00–12:15, EW 202
Work function engineering in superconducting Ir/Nb(110) films — •Adamantia Kosma1, Stefan Blügel1, and Philipp Rüßmann1,2 — 1Forschungszentrum Jülich — 2University of Würzburg
The topological superconducting hybrid structures have been attracting considerable research interest in recent years, as they are promising candidates for topologically protected qubits. Because of this, a substantial demand for appropriate superconducting substrates has been created. In our study we explore the superconducting properties of Ir/Nb(110) films. Our focus is on the investigation of the change in the work function and the size of the proximity-induced superconducting gap of Ir overlayers deposited on Nb(110). The work function plays a crucial role in determining the behavior of electrons at the superconducting surface, thereby influencing the charge transport. In the specific context of superconductor hybrid structures for Majoranas, the target is to effectively manage the work function mismatch while maintaining a robust proximity effect through the overlayer. This approach will also provide valuable information for studying the proximity effect in a topological insulator/superconductor(TI/SC) system. Our findings are based on first-principles calculations using the full-potential Korringa-Kohn-Rostoker Green function method and its Kohn-Sham Bogoliubov-de Gennes (KS-BdG) extension to describe superconducting heterostructures [1].
We thank the ML4Q (EXC 2004/1 - 390534769) for funding.
[1] P. Rüßmann, and S. Blügel, Phys. Rev. B 105, 125143 (2022).
Keywords: Topological Superconductor; Bogoliubov-de Gennes method; Proximity Effect; Heterostructure