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TT: Fachverband Tiefe Temperaturen

TT 48: Superconductivity: Heterostructures, Andreev Scattering, Proximity Effect, Vortices

TT 48.9: Vortrag

Freitag, 30. März 2012, 11:45–12:00, H 2053

A Numerical Study of the Superconducting Proximity Effect in Topological Surface States — •Roland Grein^1,2, Jens Michelsen¹, and Matthias Eschrig² — ¹Institut für Theoretische Festkörperphysik and DFG-Center for Functional Nanostructures, Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany — ²SEPnet and Hubbard Theory Consortium, Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom

We study a microcopic model to investigate the superconducting proximity effect in the topological surface states of Bi₂Se₃ by means of the recursive Green’s function technique. We find that the phenomenological Fu-Kane model, usually used to describe the proximity effect in these states, breaks down at energies close to the superconducting bulk-gap and in the case of strong coupling between the topological insulator and the superconductor[1].
R. Grein, J. Michelsen, M. Eschrig, arXiv:1111.0445 (2011)