Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 70: Transport: Topological Insulators II (organized by TT)

TT 70.8: Talk

Wednesday, April 2, 2014, 18:15–18:30, HSZ 204

Unconventional s- and p-wave proximity effect in topological insulator/superconductor structures — •Tkachov Grigory — University of Wuerzburg

Currently, much effort is being put into understanding unconventional superconductivity in topological insulators (TIs). This contribution addresses a microscopic theory of the proximity effect in three-dimensional TIs coupled to an s-wave superconductor. In agreement with earlier results [1] we demonstrate that the induced superconductivity is a mixture of singlet s-wave and triplet p-wave components [2]. Their interplay depends on several factors, such as the position of the Fermi level, excitation energy, and external magnetic fields, among others. We also discuss the role of disorder and applications of the theory to recent experiments on HgTe-based TIs [3,4].

This work was supported by the German Research Foundation (DFG), Grant No TK60/1-1.
T. D. Stanescu, J. D. Sau, R. M. Lutchyn, and S. Das Sarma, Phys. Rev. B 81, 241310(R) (2010).
G. Tkachov, Phys. Rev. B 87, 245422 (2013).
L. Maier, J. B. Oostinga, D. Knott, C. Brüne, P. Virtanen, G. Tkachov, E. M. Hankiewicz, C. Gould, H. Buhmann, and L. W. Molenkamp, Phys. Rev. Lett. 109, 186806 (2012).
J. B. Oostinga, L. Maier, P. Schüffelgen, D. Knott, P. Leubner, C. Brüne, G. Tkachov, H. Buhmann, and L. W. Molenkamp, Phys. Rev. X 2, 021007 (2013)