Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures

O 37.50: Poster

Tuesday, April 1, 2014, 18:30–22:00, P2

ab-initio investigation of topological states in α-Sn surfaces — •Sebastian Kuefner, Juergen Furthmueller, and Friedhelm Bechstedt — Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena, Germany

The properties of topological insulators recently have been discussed with rising attention in solid state physics. Topological insulators are insulating as a bulk material but exhibit metallic surface or edge states that are topologically protected and, therefore, are independent of orientation and passivation of interfaces or surfaces. Usually, the edge states show a Dirac-cone like dispersion. Mercury telluride has been proven to be a two dimensional topological insulator because of its inverted band structure. However, although α-tin shows a very similar electronic structure, it is still under debate whether α-tin is a topological insulator as well. We use density-functional theory based on a hybrid functional to investigate the electronic structure α-Sn(001) surfaces and show the existence of a topological edge state close to the Fermi level.