SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 59: Poster Session: Topology
TT 59.5: Poster
Donnerstag, 30. März 2023, 15:00–18:00, P2/OG4
Towards the quantum anomalous Hall effect in magnetic topological insulator structures — •Justus Teller1,2, Erik Zimmermann1,2, Micheal Schleenvoigt1,2, Gerrit Behner1,2, Kristof Moors1,2, Peter Schüffelgen1,2, Gregor Mussler1,2, Detlev Grützmacher1,2, and Thomas Schäpers1,2 — 1Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich, D-52425 Jülich, Germany — 2JARA-Fundamentals of Future Information Technology, Jülich-Aachen Research Alliance, Forschungszentrum Jülich and RWTH Aachen University, Germany
Three-dimensional topological insulators (TIs) are a material class which may enable robust topological quantum computing by using so-called Majorana zero modes. Published theoretical work predicts the Majorana state to exist in hybrid structures of superconductors and magnetic topological insulators which exhibit the quantum anomalous Hall effect (QAHE). We present magnetotransport measurements of Cr-doped magnetic (Bi0.27Sb0.73)2Te3 layers. At 1.2 K, the uniformly Cr-doped samples exhibit a magnetic signature whose behaviour is probed under gate influence. Based on these measurements, an existing QAHE is ruled out. The results are compared to a magnetic TI heterostructure which is comprised of a plain TI layer embedded into two layers of magnetic TI. This structure reveals the QAHE. The temperature dependence of the effect is measured. In addition, the magnetic energy gap is probed by a gate dependent measurement. The QAHE is improved by current adjustment.