Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 28: Focus Session: Topological Insulators (jointly with MA, TT)

HL 28.3: Vortrag

Dienstag, 27. März 2012, 10:00–10:15, ER 164

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

It has been recently shown that the strained epitaxial growth of bulk HgTe layers opens a band gap in the normally semi-metallic material [1]. This means that strained HgTe meets all prerequisites of a topological insulator, i.e. surface states and an insulating bulk, which does not contribute to transport measurements. The interfaces between topological insulators and superconductors are especially interesting due to the possibility of creation and detection of majorana fermions [2].

Our current work is focussing on investigating contacts between strained HgTe and Nb as a superconducting material. First results show proximity effect and multiple sub gap features which will be discussed in detail.

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

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