Regensburg 2019 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 12: HL Poster I
HL 12.29: Poster
Montag, 1. April 2019, 17:30–20:00, Poster E
Topological Hall effect in magnetically doped topological insulator thin films — •Gertjan Lippertz1,2, Andrea Bliesener1, Alexey Taskin1, Lino Pereira2, and Yoichi Ando1 — 1Institute of Physics II, University of Cologne, Germany — 2Instituut voor Kern- en Stralingsfysica, KU Leuven, Belgium
Topological insulators (TIs) belong to a new class of quantum materials in which a strong spin-orbit coupling leads to a band inversion. Time-reversal symmetry (TRS), in turn, prevents the band gap from opening at the surface of the TI, leading to a protected metallic surface state.
Breaking TRS by magnetic doping opens an energy gap at the Dirac point on the top and bottom surface of the TI. Thin films of this kind of gapped topological insulator exhibit new quantum phenomena, including the quantum anomalous Hall effect (QAHE), where spontaneous magnetization leads to a dissipationless spin-polarised edge channel and a quantized Hall resistance of h/e2.
Here we report on the observation of the topological Hall effect in V-doped (BixSb1−x)2Te3 films grown by MBE and the possible existence of Skymions.
References:
[1] R. Yu et al., Science 329, 61-65 (2010)
[2] C.-Z. Chang et al., Nature Materials 14, 473-477 (2015)
[3] K. Yasuda et al., Nature Physics 12, 555-559 (2016)