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TT: Fachverband Tiefe Temperaturen

TT 66: Superconductivity: Yu-Shiba-Rusinov and Andreev Physics

TT 66.8: Talk

Thursday, March 21, 2024, 11:30–11:45, H 3005

Identifying Ising superconductors - The role of unconventional Andreev reflection in the formation of bound states — •Michael Hein¹, Juan Carlos Cuevas², and Wolfgang Belzig¹ — ¹Universität Konstanz — ²Universidad Autónoma de Madrid

Magnetic impurities on superconducting surfaces induce so called Yu-Shiba-Rusinov (YSR) bound states. They have been widely studied using scanning tunnelling microscopy (STM) with substrates made of conventional superconductors [1]. In this work we investigate theoretically whether and how these states occur in unconventional Ising superconductors [2]. One of our main findings is the existence of sub-gap states even in the case of non-magnetic impurities. To shed light on the origin of these states, we also study the unconventional Andreev reflection at the interface between an Ising superconductor and a normal metal. This work paves the way for the understanding of the proximity effect in Ising superconductors and predicts different transport signatures that would allow to experimentally identify Ising superconductors.

[1] B. W. Heinrich et al., Prog. Surf. Sci. 93 (2018) 1

[2] G. Tang et al., Phys. Rev. Lett. 126 (2021) 237001

Keywords: Yu-Shiba-Rusinov states; Ising superconductivity; unconventional superconductivity; Andreev reflection