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Atomic, magnetic and electronic structure of the clean and adsorbate covered (0001) surface of the topological insulator Bi2Se3 - Holger L. Meyerheim - Mercredi 15 juin 2016, 11 h

INSP - 4 place Jussieu - 75252 PARIS Cedex 05 - Barre 22-23 - 3e étage, salle 317

Holger L. Meyerheim (MPI Halle, Allemagne)

Abstract

Topological insulators (TI) represent an unusual state of matter. While they are insulators in the bulk they are metals at the surface characterized by a linearly dispersing topologically protected surface state (« Dirac cone ») bridging the bulk band gap. Owing to its large band gap, Bi2Se3 is an archetype TI and tremendous interest has emerged to investigate the electronic structure and transport properties of the pristine and adsorbate covered (0001) surface. The latter is motivated by the search for new exotic quantum effects and the question whether the topological state is robust against adsorption of magnetic and non-magnetic adsorbates. By contrast, quantitative information concerning the atomically resolved geometric surface structure is hardly available. This talk gives an overview over recent progress in the analysis of the atomic structure of the pristine and adsorbate covered Bi2Se3 (0001) surface as well as its relation to the electronic and magnetic properties using surface x-ray diffraction, x-ray absorption spectroscopy, scanning tunneling microscopy, circular magentic dichroism and angular resolved photoemission spectroscopy experiments.