Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 21: Poster Monday: Topology and Symmetry-Protected Materials
O 21.5: Poster
Montag, 5. September 2022, 18:00–20:00, P4
Heterostructure engineering with the van der Waals topological insulator Bi2Te3 — M. Dittmar1,2, •E. Mantel1,2, P. Kagerer1,2, C. I. Fornari1,2, H. Bentmann1,2, and F. Reinert1,2 — 1Exp. Physik VII, Uni Würzburg — 2Würzburg-Dresden Cluster of Excellence ct.qmat
Recently, combining magnetism and topology has emerged as a promising research field spanning from topological insulator (TI)-superconductor interfaces to intrinsic magnetic systems [1]. In these systems exciting new phenomena such as Majorana modes are predicted to emerge.
Here we present two approaches to study these promising structures.
The first focuses on the intrinsically ferromagnetic monolayer of MnBi2Te4. In order to observe the predicted effects in this compound its Fermi level should be tuned inside the bulk band gap. Our approach to control the Fermi level position is to prepare a single layer of MnBi2Te4 on top of a p-n-junction of Sb2Te3 and Bi2Te3 grown by molecular beam epitaxy (MBE).
In the second approach we investigate the preparation of thin films of the TI Bi2Te3 on superconductor substrates.
In order to obtain more information about the crystalline structure and surface orientation, we use different characterization methods such as reflection high-energy electron diffraction, X-ray diffraction and low-energy electron diffraction. To investigate the impact on the electronic structures of these systems, angle resolved and X-ray photoemission specroscopy are employed.
[1] M.M. Otrokov et al., Nature 576 (2019)