Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 38: Topological Insulators (jointly with HL, MA, TT)

O 38.8: Talk

Wednesday, March 13, 2013, 11:15–11:30, H16

Induced superconductivity in the topological surface state of mercury telluride (HgTe) — •Luis Maier, Manuel Grimm, Peter Schüffelgen, Daniel Knott, Christopher Ames, Christoph Brüne, Philipp Leubner, Jeroen Oostinga, Hartmut Buhmann, and Laurens W. Molenkamp — Physikalisches Institut (EP3), Universität Würzburg, 97074 Würzburg

It has been recently demonstrated, that a strained grown layer of of HgTe is a 3D topological insulator (TI) exhibiting a single family of Dirac cone states at its surface. Since the bulk has nearly no carriers left, the transport through these structures is strongly dominated by the surface states [1].

Because of the prediction of creation of Majorana bound states [2] we are looking at a superconductor-TI interface. This talk presents our results on highly transparent S-TI-S junctions where we observe unusual behaviour in the Josephson current.

Preliminary results of this project are published in [3].

[1] C. Brüne et al., Phys. Rev. Lett. 106, 126803 (2011)

[2] L. Fu and C. L. Kane, Phys. Rev. Lett. 100, 096407 (2008)

[3] L. Maier et al., Phys. Rev. Lett. 109, 186806 (2012)