Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 61: Topology and Symmetry-Protected Materials (joint session O/MA/TT)

TT 61.2: Vortrag

Donnerstag, 4. April 2019, 15:15–15:30, H24

Magnetic and Electronic Structure of the proposed Antiferromagnetic Topological Insulator MnBi2Te4 — •Raphael Crespo Vidal1, Hendrik Bentmann1, Thiago Peixoto1, Alexander Zeugner2, Anna Isaeva2, Anja Wolter3, Bernd Büchner3, Mikhail Otrokov4, Evgueni Chulkov4, and Friedrich Reinert11Chair for Experimental Physics VII, Universität Würzburg, Germany — 2Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Germany — 3Leibniz-Institute for Solid State and Materials Research, Dresden, Germany — 4Centro de Fisica de Materials, Centro Mixto, Spain

The interplay auf magnetism and topology gives rise to new topological quantum phases with broken time-reversal symmetry like the quantum anomalous Hall state.
Here we will present single-crystal measurements on the magnetic and electronic structure of MnBi2Te4 [1], a van der Waals bonded system composed of septuple layers stacked along its [0001]-axis. The layered structure results in a high accessibility for surface science methods, while its stochiometric nature leads to intrinsic magnetism without the need of free parameters like dopand concentration. By X-Ray magnetic circular dichroism, linear dichroism and bulk magnetization measurements we determine an out of plane A-type antiferromagnetic ordering below TN = 24 K. Angle-resolved photoemission spectroscopy shows a massive Dirac-like state with an energy gap of ∼100 meV.
[1] M. Otrokov et al., ArXiv., 1809.07389 (2018)

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