SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 4: Focus Session: Correlated van-der-Waals Magnets
TT 4.1: Vortrag
Montag, 27. September 2021, 13:30–14:00, H7
Topological states in MnBi2Te4-based magnetic van der Waals materials — •Hendrik Bentmann1, Raphael. C. Vidal1, Philipp Kagerer1, Sebastian Buchberger1, Celso Fornari1, Anna Isaeva2, and Friedrich Reinert1 — 1Experimentelle Physik VII and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg — 2Van der Waals – Zeeman Institute, IoP, University of Amsterdam, 1098 XH Amsterdam, The Netherlands
Magnetic van der Waals materials down to a single monolayer have attracted considerable attention in recent years. In this talk, we will discuss electronic and magnetic properties of MnBi2Te4-based systems, in which Mn local moments and strong spin-orbit interaction of Bi and Te yield an interplay of magnetism and non-trivial band topology.
Using angle-resolved photoemission and X-ray magnetic dichroism, we provide evidence that 3D MnBi2Te4 realizes an antiferromagnetic topological insulator [1]. Incorporation
of non-magnetic Bi2Te3 spacer layers in MnBi4Te7 and MnBi6Te10 yields modified magnetic properties and surface-termination-dependent topological surface states [2].
In the 2D regime, MnBi2Te4 is a candidate for realizing the quantum anomalous Hall state. We will present ongoing efforts to grow MnBi2Te4 thin films using molecular beam epitaxy (MBE) [3].
[1] Nature 576, 416 (2019)
[2] Phys. Rev. X 9, 041065 (2019), Phys. Rev. Lett. 126, 176403 (2021)
[3] J. Appl. Phys. 128, 135303 (2020)