Structure analysis of clean and adsorbate covered Bi2Se3 using x-ray diffraction and x-ray absorption spectroscopy

DIPC Seminars

Speaker: Holger L. Meyerheim, Max-Planck-Institut für. Mikrostrukturphysik, Halle, Germany
When: 2014/10/13
18:00
Place: Donostia International Physics Center (DIPC).Paseo Manuel de Lardizabal, 4, Donostia
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$Structure analysis of clean and adsorbate covered Bi2Se3 using x-ray diffraction and x-ray absorption spectroscopy$ Topological insulators (TI) represent an unusual state of matter. While they are insulators in the bulk they are metals at the surface. Tremendous interest has emerged in the recent past primarily focused on the study of the electronic and transport properties of uncovered and adsorbate covered TI’s. The latter is motivated by the question whether the topological state is robust against adsorption of magnetic and non-magnetic adsorbates. By contrast, atomically resolved structure studies relating electronic properties to the geometric structure are hardly available. This talk gives an overview over recent progress in the structure analysis of the clean [1] and adsorbate covered Bi2Se3 (0001) surface using surface x-ray diffraction (SXRD) and x-ray absorption spectroscopy. Results are discussed in the context of theoretical predictions and angular resolved photoemission experiments. Support by DFG through SPP1666 is acknowledged. [1] Roy, S., Meyerheim, H. L., Ernst, A, Mohseni, K., Tusche, C., Vergniory, M. G., Menshchikova, T. V., Otrokov, M. M., Ryabishchenkova, A. G., Aliev, Z. S., Babanly, M. B., Kokh, K. A., Tereshchenko, O. E., Chulkov, E.V., Schneider, J., Kirschner, J. Physical Review Letters 113, 116802 (2014)