SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 74: 2D Materials IV: Heterostructures (joint session O/CPP)
O 74.4: Talk
Thursday, March 30, 2023, 11:15–11:30, GER 37
Fermi level tuning of a MnBi2Te4 monolayer — •Marco Dittmar1, Philipp Kagerer1, Celso I. Fornari1, Simon Müller1, Sergio L. Morelhão2, Hendrik Bentmann1, and Friedrich Reinert1 — 1Exp. Physik VII and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, Germany — 2Instituto de Física, Universidade de São Paulo, Brazil
By breaking time reversal symmetry, introducing magnetic order to topological insulators leads to the opening of a 2D surface state gap at the Dirac point. As a second crucial parameter, tuning the position of the Fermi level inside this gap, enables the observation of exciting new phenomena, such as the quantum anomalous Hall effect (QAHE).
Here, we focus on the intrinsic ferromagnetic monolayer of MnBi2Te4, acting as a magnetic extension of the topological insulator Bi2Te3 [1]. We tune the Fermi level position in this compound by preparing a single layer of MnBi2Te4 on top of the topologically non-trivial p-n-junction of Sb2Te3 and Bi2Te3 grown by molecular beam epitaxy (MBE) [2].
We will present a study containing structural characterization of the heterostructures by X-ray diffraction and atomic force microscopy, while the electronic structure is assessed by X-ray and angle resolved photoemission spectroscopy.
[1] M. M. Otrokov et al., 2D Mater 4, 025082 (2017)
[2] P. Kagerer et al., arXiv 2207.14421 (2022)