Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 18: Topological Insulators

TT 18.3: Vortrag

Mittwoch, 7. September 2022, 10:00–10:15, H23

Spin-polarized surface state transport in gate-tunable topological insulator — •Linh Dang¹, Oliver Breunig¹, Henry Legg², and Yoichi Ando¹ — ¹1 II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany — ²Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland

Topological insulators (TIs) possess helical spin-momentum locked surface states that can be harnessed to create a non-zero spin polarization by applying a current through the TI. Two opposite types of spin polarization have been reported on the same material, suggesting the interplay between topological surface state and Rashba spin splitting state of 2-dimensional surface electrons. These two contributing effects might be used to create a spin transistor device. In this report, we discuss the sign switching of the spin polarization by electrostatic gating based on data acquired from devices that were microfabricated on TI flakes.