Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 42: Topological insulators (organized by O)

HL 42.3: Vortrag

Dienstag, 1. April 2014, 11:00–11:15, GER 38

Reorganization of a Topologically Protected Surface State: Theory for Au-Covered Bi2Te3(111)Francisco Muñoz1,2, •Jürgen Henk2, and Ingrid Mertig21Facultad de Ciencias, Universidad de Chile, Chile — 2Martin Luther University Halle-Wittenberg, Halle, Germany

The electronic structure of Au-covered Bi2Te3 is investigated by first-principles calculations. The Dirac surface state of the topological insulator Bi2Te3 hybridizes with the Au sp states, which gives rise to strong reorganization of the surface electronic structure. Striking features of the modified Dirac surface state are (i) the introduction of new Dirac points within the fundamental band gap of Bi2Te3, (ii) an extremely weak dispersion, and (iii) an anisotropic number of conducting channels in the fundamental band gap of Bi2Te3 which leads to a complicated Fermi surface. Our findings have impact for spin-dependent surface transport.

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