SKM 2023 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 8: Yu-Shiba-Rusinov Systems
TT 8.2: Talk
Monday, March 27, 2023, 15:30–15:45, HSZ 103
Yu-Shiba-Rusinov impurity bound states in superconductors from first principles — •David Antognini Silva1, Philipp Rüßmann1,2, and Stefan Blügel1 — 1Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, Jülich, Germany — 2Würzburg Universität, Germany
Materials that combine magnetism, spin-orbit interaction and conventional s-wave superconductivity are a suitable platform to study Majorana zero modes (MZM) [1], that can be used as building blocks of fault-tolerant topological qubits. In general, magnetic impurities in superconductors leads to localized Yu-Shiba-Rusinov (YSR) states at the impurity [2]. Understanding their interplay with MZMs is crucial to achieve topological quantum computers in the future.
In our work, we implemented the Bogoliubov-de Gennes (BdG) formalism in the juKKR Korringa-Kohn-Rostoker Green function impurity code (https://iffgit.fz-juelich.de/kkr/jukkr) to allow the material-specific description of defects perfectly embedded in superconductors from first principles. We apply it to an Fe impurity embedded in bulk Pb in the normal and superconducting state, then analyse the YSR states of different magnetic transition-metal adatoms placed on a superconducting Nb(110) surface where the influence of the impurity-substrate distance on the energy of the YSR states is discussed.
[1] Nadj-Perge et al., Science 346, 6209 (2014)
[2] L. Yu, Acta Physica Sinica 21, 75 (1965)
H. Shiba, Prog. Theor. Phys. 40, 435 (1968) A. I. Rusinov, Sov. J. Exp. Theor. Phys. 29, 1101 (1969)