Perspective-The Elusive Quantum Anomalous Hall Effect in MnBi2Te4: Materials

J. Q. Yan

doi:10.1149/2162-8777/ac70fc

Perspective-The Elusive Quantum Anomalous Hall Effect in MnBi₂Te₄: Materials

J. Q. Yan

Correlated Electron Materials

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

Observation of the quantum anomalous Hall effect (QAHE) in MnBi₂Te₄ flakes is one of the most exciting results in the study of the intrinsic magnetic topological insulator MnBi₂Te₄ and related compounds. Reproducing this fascinating result has been found to be challenging. The quality of starting MnBi₂Te₄ single crystals is believed to be the key factor. An interesting and important question to address is what is the right quality to enable the QAHE. In this perspective, we present possible approaches to tuning the magnetic and topological properties of MnBi₂Te₄ by using lattice imperfections, strain, stacking sequence, and interactions between the substrate and flakes/films. It is of critical importance to eventually identify the factor(s) responsible for the realization of QAHE.

Original language	English
Article number	063007
Journal	ECS Journal of Solid State Science and Technology
Volume	11
Issue number	6
DOIs	https://doi.org/10.1149/2162-8777/ac70fc
State	Published - Jun 2022

Funding

The author thanks Matthew Brahlek, Cuizu Chang, Maohua Du, Andrew May, Michael McGuire, Robert McQueeney, Hu Miao, Ni Ni, Brian Sales, Linlin Wang, Weida Wu, and Xiaodong Xu for discussions, Zengle Huang and Weida Wu for providing the STM image, Andrew May and Michael McGuire for improving the manuscript. Work at ORNL was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.

Keywords

MnBi2Te4
intrinsic magnetic topological insulator
quantum anomalous Hall effect

Access to Document

10.1149/2162-8777/ac70fc

Cite this

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title = "Perspective-The Elusive Quantum Anomalous Hall Effect in MnBi2Te4: Materials",

abstract = "Observation of the quantum anomalous Hall effect (QAHE) in MnBi2Te4 flakes is one of the most exciting results in the study of the intrinsic magnetic topological insulator MnBi2Te4 and related compounds. Reproducing this fascinating result has been found to be challenging. The quality of starting MnBi2Te4 single crystals is believed to be the key factor. An interesting and important question to address is what is the right quality to enable the QAHE. In this perspective, we present possible approaches to tuning the magnetic and topological properties of MnBi2Te4 by using lattice imperfections, strain, stacking sequence, and interactions between the substrate and flakes/films. It is of critical importance to eventually identify the factor(s) responsible for the realization of QAHE.",

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AB - Observation of the quantum anomalous Hall effect (QAHE) in MnBi2Te4 flakes is one of the most exciting results in the study of the intrinsic magnetic topological insulator MnBi2Te4 and related compounds. Reproducing this fascinating result has been found to be challenging. The quality of starting MnBi2Te4 single crystals is believed to be the key factor. An interesting and important question to address is what is the right quality to enable the QAHE. In this perspective, we present possible approaches to tuning the magnetic and topological properties of MnBi2Te4 by using lattice imperfections, strain, stacking sequence, and interactions between the substrate and flakes/films. It is of critical importance to eventually identify the factor(s) responsible for the realization of QAHE.

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