Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 20: Topology: Poster Session
TT 20.4: Poster
Mittwoch, 7. September 2022, 15:00–18:00, P1
Quantum anomalous hall devices on magnetically doped topological insulator films — •Roozbeh Yazdanpanah Ravari1, Gertjan Lippertz1,2, Anjana Uday1, Andrea Bliesener1, Alexey Taskin1, and Yoichi Ando1 — 1University of Cologne, Cologne, Germany — 2KU Leuven, Leuven, Belgium
Magnetic doping opens an exchange gap in the surface states of topological insulators (TIs) at the Dirac point by breaking time reversal symmetry. Such systems manifest the quantum anomalous Hall (QAH) effect which is characterized by quantized Hall resistance and zero longitudinal resistance. To explore this phenomena, devices are fabricated on thin films of V-doped (Bi1−xSbx)2Te3. This contribution highlights our effort to better understand this effect, including a study of the QAH breakdown where in high current densities or small dimensions, the quantized state is lost. Another ongoing effort focuses on interfacing the quantum anomalous hall insulator (QAHI) system with a superconductor (SC) through devices with different geometries, where the obtained results suggest high transparency of the QAH/SC interface.