High Chern number phase in topological insulator multilayer structures: A Dirac cone model study

doi:10.1088/1674-1056/ac6b2e

中国物理B ›› 2022, Vol. 31 ›› Issue (9): 90501-090501.doi: 10.1088/1674-1056/ac6b2e

High Chern number phase in topological insulator multilayer structures: A Dirac cone model study

Yi-Xiang Wang(王义翔)^1,2,† and Fu-Xiang Li(李福祥)^2,‡

1 School of Science, Jiangnan University, Wuxi 214122, China;
2 School of Physics and Electronics, Hunan University, Changsha 410082, China

收稿日期:2022-04-06 修回日期:2022-04-25 接受日期:2022-04-28 出版日期:2022-08-19 发布日期:2022-08-19
通讯作者: Yi-Xiang Wang, Fu-Xiang Li E-mail:wangyixiang@jiangnan.edu.cn;fuxiangli@hnu.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 11804122 and 11905054), the China Postdoctoral Science Foundation (Grant No. 2021M690970), and the Fundamental Research Funds for the Central Universities of China.

High Chern number phase in topological insulator multilayer structures: A Dirac cone model study

Yi-Xiang Wang(王义翔)^1,2,† and Fu-Xiang Li(李福祥)^2,‡

1 School of Science, Jiangnan University, Wuxi 214122, China;
2 School of Physics and Electronics, Hunan University, Changsha 410082, China

Received:2022-04-06 Revised:2022-04-25 Accepted:2022-04-28 Online:2022-08-19 Published:2022-08-19
Contact: Yi-Xiang Wang, Fu-Xiang Li E-mail:wangyixiang@jiangnan.edu.cn;fuxiangli@hnu.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 11804122 and 11905054), the China Postdoctoral Science Foundation (Grant No. 2021M690970), and the Fundamental Research Funds for the Central Universities of China.

摘要/Abstract

摘要： We employ the Dirac cone model to explore the high Chern number (C) phases that are realized in the magnetic-doped topological insulator (TI) multilayer structures by Zhao et al. [Nature 588 419 (2020)]. The Chern number is calculated by capturing the evolution of the phase boundaries with the parameters, then the Chern number phase diagrams of the TI multilayer structures are obtained. The high-C behavior is attributed to the band inversion of the renormalized Dirac cones, along with which the spin polarization at the $\varGamma$ point will get increased. Moreover, another two TI multilayer structures as well as the TI superlattice structures are studied.

关键词: topological insulator multilayer, Chern number, phase diagram

Abstract: We employ the Dirac cone model to explore the high Chern number (C) phases that are realized in the magnetic-doped topological insulator (TI) multilayer structures by Zhao et al. [Nature 588 419 (2020)]. The Chern number is calculated by capturing the evolution of the phase boundaries with the parameters, then the Chern number phase diagrams of the TI multilayer structures are obtained. The high-C behavior is attributed to the band inversion of the renormalized Dirac cones, along with which the spin polarization at the $\varGamma$ point will get increased. Moreover, another two TI multilayer structures as well as the TI superlattice structures are studied.

Key words: topological insulator multilayer, Chern number, phase diagram

中图分类号: (Fermion systems and electron gas)

05.30.Fk

73.20.-r (Electron states at surfaces and interfaces) 81.30.Bx (Phase diagrams of metals, alloys, and oxides) 68.65.Ac (Multilayers)

Yi-Xiang Wang(王义翔) and Fu-Xiang Li(李福祥). High Chern number phase in topological insulator multilayer structures: A Dirac cone model study[J]. 中国物理B, 2022, 31(9): 90501-090501.

Yi-Xiang Wang(王义翔) and Fu-Xiang Li(李福祥). High Chern number phase in topological insulator multilayer structures: A Dirac cone model study[J]. Chin. Phys. B, 2022, 31(9): 90501-090501.

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High Chern number phase in topological insulator multilayer structures: A Dirac cone model study

High Chern number phase in topological insulator multilayer structures: A Dirac cone model study

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