Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 58: Poster Session Transport & Matter at Low Temperature
TT 58.2: Poster
Donnerstag, 14. März 2013, 15:00–19:00, Poster D
Majorana fermions in systems with coexisting density waves and superconductivity — •Daniel Mendler, Panagiotis Kotetes, and Gerd Schön — Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany
The recent discovery of topological materials such as HgTe/CdTe quantum wells and Bi-based compounds has motivated the systematic study of topological phases. Among the ten possible topological classes, we find cases in which topological systems admit Majorana bound state solutions which could be used as building blocks for topological quantum computing. In this work, we focus on strongly correlated systems that can exhibit conventional or unconventional density waves and superconductivity. We perform an exhaustive study of the possible phases by inferring their point group symmetry and topological class, in order to identify which of them can support Majorana fermions. Our results can be applied to the hexagonally warped Dirac modes living on a surface of the 3D topological insulator Bi2Te3, that demonstrates enhanced tendency towards spin density wave instabilities. Superconductivity can also emerge in this system due to correlations or proximity effects. We focus on heterostructures consisting of a superconducting wire on top of a Bi2Te3 surface and investigate the conditions under which Majorana bound states are accessible.