Dresden 2020 – wissenschaftliches Programm
Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 103: Topology and Symmetry Protected Materials I
O 103.5: Vortrag
Donnerstag, 19. März 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 Tc. 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.