Anomalous Hall Effect in Intrinsic Antiferromagnetic Topological Insulator MnBi<sub>2</sub>Te<sub>4</sub>
ORAL
Abstract
MnBi2Te4 has recently been predicted to be an intrinsic antiferromagnetic topological insulator (AFMTI)1. This material is also predicted to show ferromagnetism if its dimensionality is reduced to 2D and support other topological states, including type-II magnetic Weyl semimetal state under magnetic fields and Majorana fermions at the interface with a superconductor. Its surface states and magnetic phase transition have been experimentally observed in both bulk2 and thin-film samples3. The material provides an excellent platform to study various exotic physics as well as the realization of the quantum anomalous Hall effect at higher temperatures. Here, we report the synthesis of high-quality bulk single crystals of MnBi2Te4 by melt-growth technique. Magnetic-transport measurements on bulk samples demonstrated the first observation of the anomalous Hall effect.
1J. Li et al., arXiv:1808.08608 (2018)
2M. M. Otrokov et al., arXiv: 1809.07389 (2018)
3Y. Gong et al., arXiv:1809.07926 (2018)
1J. Li et al., arXiv:1808.08608 (2018)
2M. M. Otrokov et al., arXiv: 1809.07389 (2018)
3Y. Gong et al., arXiv:1809.07926 (2018)
*The authors acknowledge funding by NSF through the Penn State 2D Crystal Consortium−Materials Innovation Platform (2DCC-MIP) under NSF cooperative agreement DMR-1539916. Y. Z. is supported by the US DOE under EPSCoR Grant No. DE-SC0012432 with additional support from the Louisiana Board of Regents.
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Presenters
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Seng Huat Lee
- Pennsylvania State University
- 2D Crystal Consortium, Materials Research Institute, The Pennsylvania State University
- The Pennsylvania State University