Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

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

HL 85.10: Talk

Friday, March 24, 2017, 12:15–12:30, POT 251

HgTe shells on CdTe nanowires — •Jan Hajer, Maximilian Kessel, Christoph Brüne, Hartmut Buhmann, and Laurens W. Molenkamp — Physikalisches Institut, EP3, Am Hubland, 97074 Würzburg

Topological insulator nanowires in proximity to a superconductor are in research focus of condensed matter physics. Hosting Dirac-like surface states with high spin-orbit coupling, they are a possible platform for p-wave superconductivity and Majorana bound states.

In our work we investigate low temperature charge transport in quasi one-dimensional HgTe. Vapor-liquid-solid grown CdTe nanowires of high crystal quality serve as a substrate for epitaxial HgTe overgrowth. The core-shell heterostructures show residual strain, expected to transform the semi-metallic HgTe shell to a quasi one-dimensional topological insulator. Charge transport with proximitized superconductors indicates a high interface quality giving rise to the observation of multiple Andreev reflections and an induced supercurrent.