Spin scattering and noncollinear spin structure-induced intrinsic anomalous Hall effect in antiferromagnetic topological insulator MnBi2Te4

Seng Huat Lee, Yanglin Zhu, Yu Wang, Leixin Miao, Timothy Pillsbury, Hemian Yi, Susan Kempinger, Jin Hu, Colin A. Heikes, P. Quarterman, William Ratcliff, Julie A. Borchers, Heda Zhang, Xianglin Ke, David Graf, Nasim Alem, Cui Zu Chang, Nitin Samarth, Zhiqiang Mao

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102 Scopus citations

Abstract

MnBi2Te4 has recently been established as an intrinsic antiferromagnetic (AFM) topological insulator - an ideal platform to create quantum anomalous Hall insulator and axion insulator states. We performed comprehensive studies on the structure, nontrivial surface state, and magnetotransport properties of this material. Our results reveal an intrinsic anomalous Hall effect arising from a noncollinear spin structure for the magnetic field parallel to the c axis. We observed negative magnetoresistance under arbitrary field orientation below and above the Néel temperature (TN), providing clear evidence for strong spin fluctuation-driven spin scattering in both the AFM and paramagnetic states. Furthermore, we found that the nontrivial surface state opens a large gap (∼85meV) even far above TN. Our findings demonstrate that the bulk band structure of MnBi2Te4 is strongly coupled with the magnetic property and that a net Berry curvature in momentum space can be created in the canted AFM state. In addition, our results imply that the gap opening in the surface states is intrinsic, likely caused by the strong spin fluctuations in this material.

Original languageEnglish (US)
Article number012011
JournalPhysical Review Research
Volume1
Issue number1
DOIs
StatePublished - Aug 2019

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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