Dresden 2014 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 55: Transport: Topological insulators I (organized by TT)

HL 55.3: Talk

Tuesday, April 1, 2014, 14:30–14:45, HSZ 304

Band structure and magnetotransport in strained HgTe — •Jan Böttcher and Ewelina M. Hankiewicz — Universität Würzburg, Faculty for Physics and Astronomy, Am Hubland, D-97074 Würzburg

Strained mercury telluride is a 3D topological insulator with negligible bulk conductivity [1]. Here we report on band structure calculations using a six-band Kane model with a self-consistent Poisson solver. We find that while the surface states lie within the band gap, the Dirac point lies deep in the heavy hole subbands. We study this system as a function of gate voltage and give possible explanations of exciting experimental observations of the Landau level structures in high magnetic fields as well as oscillations in the Shubnikov-de Hass data at low magnetic fields.

We acknowledge financial support via grant HA 5893/4-1 within SPP 1666.
C. Brüne, C. X. Liu, E. G. Novik, E. M. Hankiewicz, H. Buhmann, Y. L. Chen, X. L. Qi, Z. X. Shen, S. C. Zhang, and L. W. Molenkamp, Phys. Rev. Lett. 106, 126803 (2011)