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Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 29: Topology- and Symmetry-Protected Materials

O 29.11: Talk

Tuesday, March 8, 2016, 13:15–13:30, S051

Probing the electronic structure of the magnetic topological insulator (BiSbV)2Te3 with soft X-ray photoelectron spectroscopy — •Thiago Ribeiro Fonseca Peixoto1,3, Mohammed Al-Baidhani1,3, Henriette Maass1,3, Christoph Seibel1,3, Hendrik Bentmann1,3, Steffen Schreyeck2,3, Martin Winnerlein2,3, Stefan Grauer2,3, Charles Gould2,3, Karl Brunner2,3, Laurens Molenkamp2,3, and Friedrich Reinert1,31EP VII, Fakultät f. Physik u. Astronomie, Uni-Würzburg — 2EP III, Fakultät f. Physik u. Astronomie, Uni-Würzburg — 3Röntgen Center for Complex Materials (RCCM), Uni-Würzburg

By means of X-ray photoemission (XPS) and absorption (XAS) spectroscopy we investigated the electronic structure of (BiSbV)2Te3 thin films, a three-dimensional magnetic topological insulator, recently reported as an anomalous quantum Hall system [1]. The films were epitaxially grown on a Si(111) crystal and covered by a Se cap to avoid contamination during exposition to air. After thermally desorbing the Se cap, the core-level lines of the constituent elements and the V L2,3 absorption edges were measured for different V concentrations (0, 2 and 4 at.%). Our data evidence the incorporation of Se atoms in the film. By means of resonant photoemission we identify the signature of the V 3d states at the Fermi level, which may contribute to the exotic transport properties of the system. We discuss the chemical environment of the V atoms and show that our techniques are well suited for the study of the electronic properties of this novel class of materials.
[1] C.-Z. Chang et al., Nat. Mat. Lett. 14, 473 (2015).

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