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TT: Fachverband Tiefe Temperaturen

TT 32: Superconductivity: Yu-Shiba-Rusinov and Andreev Physics

TT 32.2: Vortrag

Mittwoch, 19. März 2025, 15:15–15:30, H32

Shiba States in Magnet/Superconductor Heterostructures from First Principles — •Arnold Kole, Andrés Botello-Méndez, and Zeila Zanolli — Utrecht University, Utrecht, The Netherlands

The search for topological superconductors (TSC) with potential applications in quantum computing motivates the study of hybrid systems combining superconductivity, magnetism, and spin-orbit coupling. Previous work has shown the presence of in-gap states in these systems [1]. Of particular interest are Yu-Shiba-Rusinov (YSR) states, that arise due to interactions of magnetic impurities with a superconductor [1]. It has been proposed that these can be used to engineer topological superconductivity [1].

We demonstrate the emergence of topologically trivial in-gap YSR states in CrCl₃ islands on superconducting NbSe₂ [2]. Using Density Functional Theory (DFT), we show an increase of the Cr 3d density-of-states at the edge and an enhanced exchange interaction between the CrCl₃ edge and the NbSe₂ substrate [2]. This means that the CrCl₃ edge acts as a one-dimensional chain of magnetic impurities interacting with the superconducting NbSe₂. This can explain the emergence of the YSR states. Finally, we systematically show that these findings are robust to changes in computational details such as stacking, magnetic configuration and Hubbard U parameters [3].

[1] L. Schneider et al., Nat. Nanotechnol. 17, 384 (2022);

[2] J.P. Cuperus, A.H. Kole et al., submitted (2024);

[3] A.H. Kole et al., manuscript in preparation (2025).

Keywords: Superconductivity; Yu-Shiba-Rusinov; Van der Waals; Magnetism; First-principles calculations