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MA: Fachverband Magnetismus
MA 64: Surface Magnetism II (joint session O/MA)
MA 64.5: Vortrag
Freitag, 20. März 2020, 11:30–11:45, GER 38
Theory of Shiba-Shiba tunneling at the edge of a Majorana chain — •Ciprian Padurariu1, Haonan Huang2, Björn Kubala1, Christian R. Ast2, and Joachim Ankerhold1 — 1Institute for Complex Quantum Systems and IQST, Ulm University, Ulm, Germany — 2Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
The realization of the Majorana chain [1], a 1D-chain of Yu-Shiba-Rusinov (YSR) states created by magnetic impurities on the surface of a superconductor, suggests that Majorana states emerging at the edges can be probed by the 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 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 one on the superconducting sample, and have developed its theory.
This talk will expand on the theory of Shiba-Shiba tunneling and present the possible opportunities to manipulate edge states of the Majorana chain. We discuss the effects of spin-orbit coupling on tunneling, that may be relevant to the experimental realization. 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, I. K. Drozdov, J. Li, H. Chen, S. Jeon, J. Seo, A.H. MacDonald, B.A. Bernevig, A. Yazdani, Science 346, 602 (2014).