SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 36: Topological Insulators
TT 36.1: Vortrag
Mittwoch, 29. März 2023, 15:00–15:15, HSZ 103
In-plane magnetic field induced asymmetric magnetoconductance in topological insulator kinks — •Gerrit Behner1,2, Abdur Rehman Jalil1,2, Kristof Moors1,2, Erik Zimmermann1,2, Peter Schüffelgen1,2, Detlev Grützmacher1,2, and Thomas Schäpers1,2 — 1Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany — 2JARA-Fundamentals of Future Information Technology, Jülich-Aachen Research Alliance, Forschungszentrum Jülich and RWTH Aachen University, Germany
The study of the transport properties of quasi one-dimensional topological insulator (TI) nanostructures under the application of an in-plane magnetic field is crucial for the later realization of topological quantum computation building blocks. We present low temperature measurements of selectively grown TI-kinks under the application of an in-plane magnetic field. A dependence of the TI-kink resistance on the the in-plane magnetic field angle is visible in the magnetotransport data resulting in a π-periodic change of the conductance. This phenomenon originates from an orbital effect, leading to a periodic alignment of the phase-coherent states on the bottom and top surface of the topological insulator. Respectively, once the states are aligned an increased conductance in the device is observed. The measurement results are supported theoretically by an analysis of a surface Rashba-Dirac model and tight-binding calculations of an effective three-dimensional model.