Exploration of electronic states of transition metals in tetradymites and their band structure – comparison of 3d, 4d and 5d elements.

The project aim is to provide a fundamental insight into interactions of transition metal (TM) atoms with layered chalcogenide matrices in equilibrium near state. Tetradymite-like single crystals (Bi2Te3 and Bi2Se3) have been recently broadly studied as archetypes of three-dimensional topological insulators. The aim is an eventual spin manipulation in these materials. Thus, their doping with transition metals has become rather appealing especially regarding induced magnetism. However the magnetism induced this way is still ill-defined. We believe that the comparison of doping effects of tree elements within a group of transition metals 3d–5d, e.g. of group VIIIA (Fe, Ru, Os), can provide deeper insight into this issue. Results from ARPES and NanoESCA techniques in connection with magnetic and transport measurements will be used to understand the correlation between the state of doping atoms (ions) and corresponding physical properties. Corroboration of experimental results by ab-initio calculation is an important part of this project.