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HL: Fachverband Halbleiterphysik

HL 31: Focus Session: Evolution of Topological Materials into Superconducting Nanodevices II (joint session HL/TT)

HL 31.3: Talk

Wednesday, March 20, 2024, 12:15–12:30, EW 202

Superconducting transition metal dichalcogenites for TI-based topological superconducting devices — •Philipp Rüßmann — Institute for Theoretical Physics and Astrophysics, University of Würzburg, Würzburg, Germany — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, Jülich, Germany

Proximitized topological insulators (TIs) are promising materials to build topological superconductors with the promise to realise Majorana-zero modes and topologically protected quantum devices. Here, we present an overview over our recent computational studies of heterostructures between superconducting transition-metal dichalcogenites (TMDCs) and TIs [1,2]. We compare different TMDC/TI interfaces and analyze the influence of the TMDCs on charge doping, band alignment and the superconducting proximity effect in the TI.

In our work we employ Kohn-Sham Bogoliubov-de Gennes simulations for the superconducting electronic structure based on density functional theory which is implemented in the full-potential relativistic Korringa-Kohn-Rostoker Green function method [3,4].

[1] Xian-Kui Wei et al., arXiv 2311.16590 (2023)

[2] Abdur Rehman Jalil et al., in preparation (2023)

[3] P Rüßmann and S Blügel, PRB 105, 125143 (2022).

[4] JuDFTteam/JuKKR (2022). doi: 10.5281/zenodo.7284738

Keywords: topological superconductor; topological insulator; heterostructure; transition metal dichalcogenide; Majorana fermions