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TT: Fachverband Tiefe Temperaturen

TT 8: Focus Session: Emerging Phenomena in Superconducting Low Dimensional Hybrid Systems II

TT 8.1: Talk

Tuesday, September 28, 2021, 13:30–13:45, H7

Theory of Shiba-Shiba tunneling at the edge of a Majorana chain — •Ciprian Padurariu¹, Haonan Huang², Björn Kubala^1,3, Christian R. Ast², and Joachim Ankerhold¹ — ¹Institute for Complex Quantum Systems and IQST, Ulm University, Ulm, Germany — ²Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany — ³Institute of Quantum Technologies, German Aerospace Center (DLR), Ulm, Germany

The realization of the Majorana chain [1], a 1D-chain of Yu-Shiba-Rusinov (YSR) impurity states on the surface of a superconductor, suggests that Majorana states emerging at the edges can be probed by an STM. Recently, we have developed an ideal tool to probe and manipulate the edge states of a Majorana chain. It consists of a superconducting STM tip functionalized with its own in-gap YSR state created by a magnetic impurity on the tip. With this device we have studied the sharp resonant transport between the YSR state on the tip and another YSR on the sample, and have developed its theory [2].

This presentation will expand on the theory of Shiba-Shiba tunneling and present the possibilities to manipulate edge states of the Majorana chain. In certain parameter regimes theory predicts that the edge state will transfer from the chain to the tip. This may provide a first step towards realizing braiding of edge states using the STM.
[1] S. Nadj-Perge, et al., Science 346, 602 (2014)
[2] H. Huang, et al., Nat. Phys. 16, 1227 (2020)