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O: Fachverband Oberflächenphysik

O 74: 2D Materials IV: Heterostructures (joint session O/CPP)

O 74.4: Vortrag

Donnerstag, 30. März 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)