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TT: Fachverband Tiefe Temperaturen
TT 66: Superconductivity: Yu-Shiba-Rusinov and Andreev Physics
TT 66.3: Talk
Thursday, March 21, 2024, 10:00–10:15, H 3005
First principles analysis of Gd nanostructures on superconducting Nb(110) — •David Antognini Silva1, Philipp Rüßmann1,2, and Stefan Blügel1 — 1Peter Günberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, Germany — 2Würzburg University, Germany
Materials that combine magnetism, spin-orbit interaction and conventional s-wave superconductivity are a suitable platform to study Yu-Shiba-Rusinov (YSR) states [1-3] and Majorana zero modes (MZM) [4], that can be used as building blocks of fault-tolerant topological qubits.
Recently, STM experiments for Gd chains on Nb(110) surface showed indication of MZMs at the ends of the chains [5]. To better understand the nature of those modes, we implemented the Bogoliubov-de Gennes (BdG) formalism in the juKKR impurity code [6] that allows the material-specific description of defects in superconductors from first principles, and applied it to Gd adatom nanostructures placed on the superconducting Nb(110) surface. We analyze the YSR states arising from the coupling of the magnetic Gd atoms and investigate their dependence on the geometry of the nanocluster and its magnetic ordering.
This work was funded by the DFG through Germany’s Excellence Cluster ML4Q (EXC 2004/1 - 390534769).
[1] L. Yu, Acta Physica Sinica 21 (1965) 75
[2] H. Shiba, Prog. Theor. Phys. 40 (1968) 435
[3] A. I. Rusinov, Sov. J. Exp. Theor. Phys. 29 (1969) 1101
[4] Nadj-Perge et al., Science 346 (2014) 6209
[5] Y. Wang et al., arXiv.2311.09742
[6] https://iffgit.fz-juelich.de/kkr/jukkr
Keywords: Yu-Shiba-Rusinov; Superconductivity; Magnetism; Majorana; Quantum Computing