Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 15: Focus Session: Evolution of Topological Materials into Superconducting Nanodevices (joint session HL/TT)
TT 15.10: Vortrag
Montag, 18. März 2024, 17:30–17:45, EW 202
Conductance asymmetry in proximitized magnetic topological insulator junctions with Majorana modes — •Daniele Di Miceli1,2, Eduárd Zsurka2,3,4, Julian Legendre2, Kristof Moors3,4, Thomas Schmidt2, and Llorenç Serra1,5 — 1Institute for Cross-Disciplinary Physics and Complex Systems IFISC (CSIC-UIB) — 2Department of Physics and Materials Science, University of Luxembourg, 1511 Luxembourg, Luxembourg — 3PGI-9, Forschungszentrum Jülich — 4JARA-Fundamentals of Future Information Technology, Jülich-Aachen Research Alliance, Forschungszentrum Jülich and RWTH Aachen University — 5Department of Physics, University of the Balearic Islands
Magnetic topological insulators are outstanding candidates for the realization of topological 1D and 2D superconducting phases when coupled by proximity to ordinary s-wave superconductors. We study normal-superconductor-normal junctions made of narrow (wirelike) or wide (filmlike) magnetic topological insulator slabs with a central proximitized sector. Specifically, we investigate how the electronic transport depends on the topological phase of the central superconductor when the voltage bias is split asymmetrically between the two normal leads of the junction. The occurrence of charge-nonconserving Andreev processes entails a nonzero conductance related to an electric current flowing to ground from the proximitized sector of the junction. We show that topologically protected Majorana modes require an antisymmetry of this conductance with respect to the point of equally split bias across the junction.
Keywords: Topological superconductor; Majorana modes; Magnetic topological insulators; Conductance asymmetry