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O: Fachverband Oberflächenphysik

O 29: Topological Insulators

O 29.3: 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 Muñoz^1,2, •Jürgen Henk², and Ingrid Mertig² — ¹Facultad 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.