Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 7: (Quantum) Transport Properties

HL 7.3: Talk

Monday, September 5, 2022, 15:30–15:45, H31

Aharonov-Bohm oscillations and phase-coherence analysis in selectivly grown topological-insulator rings — •Gerrit Behner, Dennis Heffels, Jonas Kölzer, Kristoff Moors, Abdur Rehman Jalil, Erik Zimmermann, Gregor Mussler, Detlev Grützmacher, Hans Lüth, and Thomas Schäpers — Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany

The study of quantum-interference effects in 3D topological insulators is crucial for understanding their transport properties. We present low-temperature magneto-transport measurements on selectively-grown Sb₂Te₃ ring structures. Pronounced Aharonov-Bohm oscillations in the conductance are observed with a major contribution of surface-state transport. The surface contributions are determined from magnetotransport under the application of an in-plane magnetic field. Furthermore we determine the phase-coherence length by analysing universal conductance fluctuations. Finally, we perform quantum transport simulations based on tight-binding calculations using KWANT. The simulations allow us to reproduce the predominant features of the experimental data and further deepen the understanding of the underlying physical effects.