Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 36: Poster III

HL 36.39: Poster

Mittwoch, 20. März 2024, 18:00–20:30, Poster E

Optimization of magnetic topological insulators by magneto-transport measurements — •Jonas Buchhorn1,2, Jan Karthein1,2, Kaycee Underwood1,2, Abdur Rehman Jalil1,2, Michael Schleenvoigt1,2, Peter Schüffelgen1,2, Detlev Grützmacher1,2, and Thomas Schäpers1,21Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany — 2JARA-Fundamentals of Future Information Technology, Jülich-Aachen Research Alliance, Forschungszentrum Jülich und RWTH Aachen University, 52425 Jülich, Germany

Edge channels in magnetic topological insulators in the quantum anomalous Hall state are a promising platform for quantum computing, when they are in proximity to a superconductor. Majorana modes are proposed to emerge which by non-abelian braiding statistics lead to a fault-tolerant computing paradigm. In this work, probing the chiral edge channels in Cr-doped (BixSb1−x)2Te3 thin films is shown together with other properties of this material system that are observable by quasi DC magneto-transport measurements in Hall bars at cryogenic temperatures. A time-efficient feedback loop between electrical measurements and molecular beam epitaxy was established to investigate the impact of growth parameters on the magneto-transport properties of the thin films with minimal fabrication. The results of the feedback loop are presented and, together with the findings of the Hall bar measurements, they lead to a guideline on how to tune the magnetic topological insulator into the bulk- and surface-insulating regime, isolating the chiral edge channels from residual conductance.

Keywords: magnetic topological insulator; quantum anomalous Hall effect; magneto-transport; van der Pauw; molecular beam epitaxy

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