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TT: Fachverband Tiefe Temperaturen

TT 4: Transport: Topological Insulators 1 (jointly with HL and MA)

TT 4.11: Talk

Monday, March 26, 2012, 12:15–12:30, H 3010

Supersymmetry and Ballistic Transport in Topological Insulators with Ferromagnetic Domain-walls — •Christian Wickles and Wolfgang Belzig — Universität Konstanz, Fachbereich Physik, 78457 Konstanz, Germany

We consider the surface Dirac Fermions of a topological insulator with a proximity induced ferromagnetic domain wall (DW). We present an exact analytical treatment to discuss the spectrum, bound states and the ballistic conductance of the system with a DW in the in-plane and out-of-plane configuration. In the latter case of the "mass" DW, we find oscillations in the conducatance as a function of the wall width and we find for certain widths the DW to be completely reflectionless. We will use the language of supersymmetry to reveal that the dispersion of the surface Dirac Fermions together with the specific DW profile gives rise to these interesting features.