Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 103: Topology and Symmetry Protected Materials I

O 103.5: Talk

Thursday, March 19, 2020, 11:30–11:45, WIL A317

Photoelectron spectroscopy on the transition metal doped topological insulator V:(Bi,Sb)₂Te₃. — •Philipp Kagerer¹, Thiago R. F. Peixoto¹, Raphael Crespo Vidal¹, Sonja Schatz¹, Martin Winnerlein², Steffen Schreyeck², Celso I. Fornari¹, Katharina Kißner¹, Charles Gould², Karl Brunner², Laurens W. Molenkamp², Hendrik Bentmann¹, and Friedrich Reinert¹ — ¹Experimental Physics VII, University of Würzburg — ²Experimental Physics III, University of Würzburg

On the path towards combining topological surface states with ferromagnetism, transition-metal doped topological insulators have shown to be promising material systems. Here, we focus on V-doped (Bi,Sb)₂Te₃ thin films, which exhibit the quantum anomalous Hall effect (QAHE) at low temperatures and a ferromagnetic ground state with a comparably high T_c. Nevertheless, the electronic structure is still not comprehensively understood. We present a detailed study of the electronic structure of V:(Bi,Sb)₂Te₃ films based on angle-resolved photoemission spectroscopy (ARPES) in laboratory- and synchrotron-based experiments. Using systematic photon-energy dependent measurements, including resonant photoemission at the V L-edge, we study the electronic states close to the Fermi energy. Our results show that the topological surface state overlaps energetically with a dispersionless V impurity band. In our studies we will investigate the interplay between those states and search for possibilities of material engineering by tuning the position of the Fermi energy.