Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 80: Focus Session: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy 3
O 80.6: Vortrag
Freitag, 9. September 2022, 11:45–12:00, S051
Theory of transport between superconducting states bound to magnetic impurities — •Ciprian Padurariu1, Haonan Huang2, Björn Kubala1,3, 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 superconducting states bound to magnetic impurities, suggests that Majorana edge states can be probed using the superconducting tunneling microscope (STM). Recently, we have developed an ideal tool to probe and manipulate the edge states of a Majorana chain. It consists of a mK-STM with its own in-gap Yu-Shiba-Rusinov (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 the theory [2].
Here, we summarize and expand the theory of YSR-YSR tunneling to phenomena that occur when one YSR state is close to zero energy, near its quantum phase transition. If the zero-energy state sits at the edge of a Majorana impurity chain, theory predicts that the topological edge state will transfer from the chain to the tip.
[1] S. Nadj-Perge, et al., "Observation of Majorana fermions in ferromagnetic atomic chains on a superconductor", Science 346, 602 (2014).
[2] H. Huang, et al., "Tunneling dynamics between superconducting bound states at the atomic limit", Nat. Phys. 16, 1227 (2020).