Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Spin Scattering and Noncollinear Spin Structure-Induced Intrinsic Anomalous Hall Effect in Antiferromagnetic Topological Insulator MnBi2Te4

Published

Author(s)

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

Abstract

MnBi2Te4 has recently been established as an intrinsic antiferromagnetic (AFM) topological insulator - an ideal platform to create quantum anomalous Hall (QAH) 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 non-collinear spin structure for the magnetic field parallel to the c-axis. We also observed remarkable negative magnetoresistance under arbitrary field orientation below and above the Neel 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. These findings demonstrate that the bulk band structure of MnBi2Te4 is strongly coupled with the magnetic structure and that a net Berry curvature in momentum space can be created in a 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 near the surface layers.
Citation
Physical Review Research
Volume
1
Issue
1

Keywords

Topological Insulators, Magnetism, Neutron Scattering

Citation

Lee, S. , Zhu, Y. , Wang, Y. , Miao, L. , Pillsbury, T. , Yi, H. , Kempinger, S. , Hu, J. , Heikes, C. , Quarterman, P. , Ratcliff, W. , Borchers, J. , Zhang, H. , Ke, X. , Graf, D. , Alem, N. , Chang, C. , Samarth, N. and Mao, Z. (2019), Spin Scattering and Noncollinear Spin Structure-Induced Intrinsic Anomalous Hall Effect in Antiferromagnetic Topological Insulator MnBi<sub>2</sub>Te<sub>4</sub>, Physical Review Research, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=928072 (Accessed March 2, 2024)
Created August 18, 2019, Updated October 12, 2021