Past QuMat seminars in Utrecht

The QuMat seminars in Utrecht is a bi-weekly joint venture between Utrecht’s experimental and theoretical condensed matter physics groups.
Coming QuMat seminars are listed here.

Videos from previous talks are available on youtube and listed here.

Density functional Bogoliubov-de Gennes calculations for a topological superconductor

Speaker: Philipp Rüßmann – Forschungszentrum Jülich

Host: Zeila Zanolli


The possibility to combine topological electronic band structures and superconductivity (SC) opens new pathways towards engineering exotic quantum matter. Proximity-induced SC in the topological surface state of topological insulators (TIs) offers the possibility to realize a chiral 𝑝-wave superconductor. This is an exotic state of matter which supports non-Abelian anyons and is of great interest for Majorana-based quantum computing applications. Material-specific insights into the microscopic details of such SC/TI interfaces are of great interest and an indispensable ingredient in the challenging materials optimization problem. Here we first introduce the recent Bogoliubov de-Gennes (BdG) extension to the all electron full potential relativistic Korringa-Kohn-Rostoker (KKR) Green function code juKKR [1,2]. This KKR-BdG method allows a description of inhomogeneous superconductors on the basis of density functional theory. We apply this method to the 𝑠 -wave superconductor Nb and study its (110) surface [1]. We then turn to the investigation of the proximity effect in Nb/TI interfaces and discuss the induced superconductivity in the topological surface state of this SC/TI heterostructure [3].

This work was supported by the ML4Q Cluster of Excellence (EXC 2004/1 – 390534769) and by the Bavarian Ministry of Economic Affairs, Regional Development and Energy within Bavaria’s High-Tech Agenda Project “Bausteine für das Quantencomputing auf Basis topologischer Materialien mit experimentellen und theoretischen Ansätzen” (grant allocation no. 07 02/686 58/1/21 1/22 2/23).

[1] Philipp Rüßmann and Stefan Blügel, Phys. Rev. B 105, 125143 (2022)
[2] The juKKR code package,
[3] Philipp Rüßmann and Stefan Blügel, arXiv:2208.14289 (2022)

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