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HL: Fachverband Halbleiterphysik

HL 24: Topological insulators: mostly interaction with magnetic fields (with MA/TT)

HL 24.1: Talk

Monday, March 31, 2014, 15:45–16:00, POT 081

SQUID devices built form S-TI-S junctions based on mercury telluride (HgTe) — •Luis Maier, Manuel Grimm, Christopher Armes, Christoph Brüne, Hartmut Buhmann, and Laurens W. Molenkamp — Physikalisches Institut (EP3), Universität Würzburg, 97074 Würzburg

In the search for Majorana fermions, one way to show their existence requires an interface of a s wave superconductor and a strong topological insulator (TI) [1]. It has already been shown, that a three-dimensional, strained layer of HgTe shows dominant surface conductance in magnetotransport measurements and thus is considered as a 3D-TI [2]. Here we investigate the interaction of superconducting contacts with Dirac Fermions.

S-TI-S junctions based on HgTe and Nb have already been fabricated and characterized successfully [3]. As a next step in this research we created SQUID structures to further study the current phase relation in these special devices. In this talk we are going to present our recent results searching for deviations from normal behaviour that could point to TI or Majorana interactions.

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

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

[3] J. Oostinga et al., Phys. Rev. X 3, 021007 (2013)