Discovery of controllable high Chern number quantum anomalous Hall state in tetragonal lattice FeSIn

doi:10.1088/1674-1056/ad2bf1

中国物理B ›› 2024, Vol. 33 ›› Issue (6): 67102-067102.doi: 10.1088/1674-1056/ad2bf1

Discovery of controllable high Chern number quantum anomalous Hall state in tetragonal lattice FeSIn

Xiao-Lang Ren(任小浪) and Chang-Wen Zhang(张昌文)†

School of Physics and Technology, Institute of Spintronics, University of Jinan, Jinan 250022, China

收稿日期:2023-12-12 修回日期:2024-02-07 接受日期:2024-02-22 出版日期:2024-06-18 发布日期:2024-06-18
通讯作者: Chang-Wen Zhang E-mail:ss_zhangchw@ujn.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 52173283), the Taishan Scholar Program of Shandong Province, China (Grant No. ts20190939), and the Independent Cultivation Program of Innovation Team of Jinan City (Grant No. 2021GXRC043).

Discovery of controllable high Chern number quantum anomalous Hall state in tetragonal lattice FeSIn

Xiao-Lang Ren(任小浪) and Chang-Wen Zhang(张昌文)†

School of Physics and Technology, Institute of Spintronics, University of Jinan, Jinan 250022, China

Received:2023-12-12 Revised:2024-02-07 Accepted:2024-02-22 Online:2024-06-18 Published:2024-06-18
Contact: Chang-Wen Zhang E-mail:ss_zhangchw@ujn.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 52173283), the Taishan Scholar Program of Shandong Province, China (Grant No. ts20190939), and the Independent Cultivation Program of Innovation Team of Jinan City (Grant No. 2021GXRC043).

1. 2024-067102-SI.pdf(1568KB)

摘要/Abstract

摘要： Quantum anomalous Hall (QAH) insulators have excellent properties driven by fancy topological physics, but their practical application is greatly hindered by the observed temperature of liquid nitrogen, and the QAH insulator with high Chern number is conducive to spintronic devices with lower energy consumption. Here, we find that monolayer FeSIn is a good candidate for realizing the QAH phase; it exhibits a high magnetic transition temperature of 221K and tunable $C = \pm 2$ with respect to magnetization orientation in the $y$-$z$ plane. After the application of biaxial strain, the magnetic axis shifts from the $x$-$y$ plane to the $z$ direction, and the effect of the high $C $ and ferromagnetic ground state on the stress is robust. Also, the effect of correlation $U$ on $C$ has been examined. These properties are rooted in the large size of the Fe atom that contributes to ferromagnetic kinetic exchange with neighboring Fe atoms. These findings demonstrate monolayer FeSIn to be a major template for probing novel QAH devices at higher temperatures.

关键词: high Chern number, Weyl semimetals, quantum anomalous Hall insulator, magnetic transition temperature

Abstract: Quantum anomalous Hall (QAH) insulators have excellent properties driven by fancy topological physics, but their practical application is greatly hindered by the observed temperature of liquid nitrogen, and the QAH insulator with high Chern number is conducive to spintronic devices with lower energy consumption. Here, we find that monolayer FeSIn is a good candidate for realizing the QAH phase; it exhibits a high magnetic transition temperature of 221K and tunable $C = \pm 2$ with respect to magnetization orientation in the $y$-$z$ plane. After the application of biaxial strain, the magnetic axis shifts from the $x$-$y$ plane to the $z$ direction, and the effect of the high $C $ and ferromagnetic ground state on the stress is robust. Also, the effect of correlation $U$ on $C$ has been examined. These properties are rooted in the large size of the Fe atom that contributes to ferromagnetic kinetic exchange with neighboring Fe atoms. These findings demonstrate monolayer FeSIn to be a major template for probing novel QAH devices at higher temperatures.

Key words: high Chern number, Weyl semimetals, quantum anomalous Hall insulator, magnetic transition temperature

中图分类号: (Bipolarons)

71.38.Mx

75.50.Pp (Magnetic semiconductors) 73.20.At (Surface states, band structure, electron density of states)

Xiao-Lang Ren(任小浪) and Chang-Wen Zhang(张昌文). Discovery of controllable high Chern number quantum anomalous Hall state in tetragonal lattice FeSIn[J]. 中国物理B, 2024, 33(6): 67102-067102.

Xiao-Lang Ren(任小浪) and Chang-Wen Zhang(张昌文). Discovery of controllable high Chern number quantum anomalous Hall state in tetragonal lattice FeSIn[J]. Chin. Phys. B, 2024, 33(6): 67102-067102.

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Discovery of controllable high Chern number quantum anomalous Hall state in tetragonal lattice FeSIn

Discovery of controllable high Chern number quantum anomalous Hall state in tetragonal lattice FeSIn

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