Antiferromagnetic topological insulator MnBi<sub>2</sub>Te<sub>4</sub>
ORAL
Abstract
Using ab initio and Monte Carlo calculations we predict the van der Waals layered compound MnBi2Te4 to be antiferromagnetic (AFM) topological insulator [1], which is further confirmed experimentally [1]. MnBi2Te4 appears to be invariant with respect to the combination of the time-reversal and primitive-lattice translation symmetries, giving rise to the Z2 topological classification of AFM insulators, and Z2=1 for MnBi2Te4. Its (0001) surface, breaking the combined symmetry, shows a giant gap in the topological surface state thus representing a promising platform for the quantized magnetoelectric effect observation. In the 2D limit, MnBi2Te4 shows a unique set of thickness-dependent magnetic and topological transitions, which drive it through FM and (un)compensated AFM phases, as well as quantum anomalous Hall (QAH) and intrinsic zero plateau QAH states [2].
[1] M. Otrokov et al., arXiv:1809.07389
[2] M. Otrokov et al., arXiv:1810.05289
[1] M. Otrokov et al., arXiv:1809.07389
[2] M. Otrokov et al., arXiv:1810.05289
*The supports by the Spanish Ministerio de Economia y Competitividad (FIS2016-75862-P), Academic D.I. Mendeleev Fund Program of Tomsk State University (8.1.01.2018), Saint Petersburg State University grant for scientific investigations (15.61.202.2015), and Fundamental Research Program of the State Academies of Sciences for 2013-2020 are acknowledged.
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Presenters
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Mikhail Otrokov
- IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain