Regensburg 2013 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 28: Transport & Diffusion III
MM 28.2: Talk
Tuesday, March 12, 2013, 15:15–15:30, H26
Majorana fermions from Landau quantization in a superconductor-topological insulator hybrid structure — •Rakesh P Tiwari1, Ulrich Zuelicke2, and Christoph Bruder1 — 1Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland — 2School of Chemical and Physical Sciences and MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
We show that the interplay of cyclotron motion and Andreev reflection experienced by massless-Dirac-like charge carriers in topological-insulator surface states generates a Majorana-particle excitation. Based on an envelope-function description of the Dirac-Andreev edge states, we discuss the kinematic properties of the Majorana mode and find them to be possible to be tuned by changing the superconductor's chemical potential and/or the magnitude of the perpendicular magnetic field. Our proposal opens up new possibilities for studying Majorana fermions in a controllable setup.