SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 8: Focus Session: Emerging Phenomena in Superconducting Low Dimensional Hybrid Systems II
TT 8.5: Vortrag
Dienstag, 28. September 2021, 14:45–15:00, H7
Supercurrent-enabled Andreev reflection in a chiral quantum Hall edge state — •Andreas Bock Michelsen1,2, Patrik Recher3, Bernd Braunecker1, and Thomas Schmidt2 — 1SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK — 2Department of Physics and Materials Science, University of Luxembourg, L-1511 Luxembourg, Luxembourg — 3Institut für Mathematische Physik, Technische Universität Braunschweig, 38106 Braunschweig, Germany
A chiral, spinless quantum Hall edge state placed in proximity to an s-wave superconductor experiences induced superconducting correlations. This effect provides a promising pathway to the realization of Majorana zero-modes and their parafermionic generalizations as non-Abelian anyons. Recent experiments have observed the phenomenon through conductance signatures of the mediating process of Andreev reflection, where electrons tunnel in pairs. We develop a tunneling model of the system and demonstrate that this process is enabled by the superconductor surface hosting spin-orbit coupling and a supercurrent induced by the strong magnetic field. By integrating out the superconductor we develop an effective model of the proximitized edge state, and derive an expression for the probability of an electron being transported as a hole through the edge state. This lets us analytically predict the outcome of conductance measurements given external experimental parameters.