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Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 21: Poster Monday: Topology and Symmetry-Protected Materials

O 21.1: Poster

Monday, September 5, 2022, 18:00–20:00, P4

Local manifestations of thickness dependent topology and axion edge state in topological magnet MnBi2Te4 — •Felix Lüpke1,2, Anh Pham2, Yi-Fan Zhao3, Ling-Jie Zhou3, Wenchang Lu4,5, Emil Briggs4, Jerzy Bernholc4,5, Marek Kolmer2,6, Wonhee Ko2, Cui-Zu Chang3, Panchapakesan Ganesh2, and An-Ping Li21Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, Germany — 2Center for Nanophase Materials Sciences, Oak Ridge National Lab, USA — 3Physics, The Pennsylvania State University, USA — 4Physics, North Carolina State University, USA — 5Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37916, USA — 6Ames Laboratory, USA

The interplay of non-trivial band topology and magnetism gives rise to a series of exotic quantum phenomena, such as the emergent quantum anomalous Hall (QAH) effect. Many of these phenomena have local manifestations when the global symmetry is broken. Here, we report local signatures of the thickness dependent topology in intrinsic magnetic topological insulator MnBi2Te4 (MBT), using scanning tunneling microscopy and spectroscopy on molecular beam epitaxy grown MBT thin films. A thickness-dependent band gap with an oscillatory feature is revealed, which we reproduce with theoretical calculations. At step edges, we observe localized electronic features, in agreement with topological phase transitions across the steps.

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