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O: Fachverband Oberflächenphysik

O 10: Poster Session I: Topological insulators

O 10.5: Poster

Monday, March 1, 2021, 10:30–12:30, P

Temperature Evolution of the Magnetic Gap in the Ferromagnetic Topological Insulator MnSb2Te4 probed by Scanning Tunneling Spectroscopy — •Philipp Küppers1, Stefan Wimmer2, Andreas Ney2, Jannik Zenner1, Marcus Liebmann1, Markus Morgenstern1, Günther Bauer2, and Gunther Springholz21II. Institute of Physics B and JARA-FIT, RWTH Aachen Unversity, 52074 Aachen, Germany — 2Institut für Halbleiter- und Festkörperphysik, Johannes Kepler Universität, Altenberger Straße 69, 4040 Linz, Austria

MnSb2Te4 has recently been established as a ferromagnetic topological insulator with out-of-plane anisotropy and large Curie temperature TC = 40-50 K [1]. Here, we show that it exhibits a band gap at the Fermi level that closes rather precisely at TC using scanning tunneling spectroscopy (STS) down to 4 K. At 4K, the gap has an average size of 17 meV exhibiting spatial fluctuations due to disorder with strength 11 meV and correlation length 2nm. We also applied in-plane magnetic fields in order to close the gap by changing of the magnetic orientation.

[1] Wimmer et al., arXiv:2011.07052 (2020)

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