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HL: Fachverband Halbleiterphysik

HL 85: Topological Insulators III (joined session with TT)

HL 85.2: Vortrag

Freitag, 24. März 2017, 09:45–10:00, POT 251

Aharonov-Bohm-type oscillations in HgTe topological insulator nanowires — •Johannes Ziegler¹, Raphael Kozlovsky², Ming-Hao Liu², Dmitriy Kozlov^1,3,4, Hubert Maier¹, Ze Don Kvon^3,4, Nikolay Mikhailov³, Sergey Dvoretsky³, and Dieter Weiss¹ — ¹Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Germany — ²Institut für Theoretische Physik, Universität Regensburg, Germany — ³A.V. Rzhanov Institue of Semiconductor Physics, Novosibirsk, Russia — ⁴Novosibirsk State University, Russia

In topological insulator nanowires, the helical surface states form a conducting cylinder enclosing the bulk. These states give rise to Aharonov-Bohm-type oscillations when a magnetic field is applied along the wire axis [1]. These oscillations, periodic with the flux quantum Φ₀, are predicted to change their phase periodically as a function of the Fermi level E_f. We fabricate nanowires with typical cross sections of 80 x 150nm using an optimized wet etching process to maintain the high mobility and mean free path. In our experiments, we found, as expected, h/e periodic oscillations as a function of magnetic flux Φ with alternating maxima and minima as a function of E_f for Φ/Φ₀ = 1/2 and Φ/Φ₀ = 1. We compare the resulting periodicity with a simple model and electrostatic simulations.

[1] J.H. Bardarson et al., Phys. Rev. L 105, 156803 (2010)