Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 86: Topology and Symmetry-Protected Materials (joint session O/MA/TT)

O 86.3: Vortrag

Donnerstag, 4. April 2019, 15:30–15:45, H24

XAS/XMCD study of magnetically doped (Bi,Sb)₂Te₃ — •Abdul-Vakhab Tcakaev, Volodymyr Zabolotnyy, Steffen Schreyeck, Karl Brunner, Charles Gould, and Vladimir Hinkov — University Würzburg, Am Hubland, 97074 Würzburg

The magnetic topological insulators Cr:(BiSb)₂Te₃ and V:(BiSb)₂Te₃ have been extensively studied as realizations of the quantum anomalous Hall (QAH) effect. While the QAH state in V-doped films is found to be significantly superior, the differences in the electronic structure and in the mechanisms of magnetic ordering for V- and Cr-doping remain under intensive debate. Here we combine x-ray absorption(XAS) and x-ray magnetic circular dichroism (XMCD) to trace element-specific contributions to the electronic and magnetic properties of these systems. We use ab initio density functional theory (DFT) based multiplet ligand field theory calculations (MLFT) at Cr and V L_2,3 edges for understanding and interpreting experimental results and determine local electronic and magnetic properties of these topological insulators.