Giant Rashba-like spin-orbit splitting with distinct spin texture in two-dimensional heterostructures

doi:10.1088/1674-1056/ac0784

中国物理B ›› 2021, Vol. 30 ›› Issue (8): 87307-087307.doi: 10.1088/1674-1056/ac0784

Giant Rashba-like spin-orbit splitting with distinct spin texture in two-dimensional heterostructures

Jianbao Zhu(朱健保)^1,2, Wei Qin(秦维)², and Wenguang Zhu(朱文光)^1,2,†

1 Department of Physics, University of Science and Technology of China, and Key Laboratory of Strongly-Coupled Quantum Matter Physics, Chinese Academy of Sciences, Hefei 230026, China;
2 International Center for Quantum Design of Functional Materials(ICQD), Hefei National Laboratory for Physical Sciences at the Microscale, and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China

收稿日期:2021-05-02 修回日期:2021-05-27 接受日期:2021-06-03 出版日期:2021-07-16 发布日期:2021-08-02
通讯作者: Wenguang Zhu E-mail:wgzhu@ustc.edu.cn
基金资助:
Project supported by the Science Fund from the Ministry of Science and Technology of China (Grant Nos. 2017YFA0204904 and 2019YFA0210004), the National Natural Science Foundation of China (Grant Nos. 11674299 and 11634011), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB30000000), the Fund of Anhui Initiative Program in Quantum Information Technologies (Grant No. AHY170000), and the Fundamental Research Funds for the Central Universities, China (Grant No. WK3510000013).

Giant Rashba-like spin-orbit splitting with distinct spin texture in two-dimensional heterostructures

Jianbao Zhu(朱健保)^1,2, Wei Qin(秦维)², and Wenguang Zhu(朱文光)^1,2,†

1 Department of Physics, University of Science and Technology of China, and Key Laboratory of Strongly-Coupled Quantum Matter Physics, Chinese Academy of Sciences, Hefei 230026, China;
2 International Center for Quantum Design of Functional Materials(ICQD), Hefei National Laboratory for Physical Sciences at the Microscale, and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China

Received:2021-05-02 Revised:2021-05-27 Accepted:2021-06-03 Online:2021-07-16 Published:2021-08-02
Contact: Wenguang Zhu E-mail:wgzhu@ustc.edu.cn
Supported by:
Project supported by the Science Fund from the Ministry of Science and Technology of China (Grant Nos. 2017YFA0204904 and 2019YFA0210004), the National Natural Science Foundation of China (Grant Nos. 11674299 and 11634011), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB30000000), the Fund of Anhui Initiative Program in Quantum Information Technologies (Grant No. AHY170000), and the Fundamental Research Funds for the Central Universities, China (Grant No. WK3510000013).

摘要/Abstract

摘要： Based on first-principles density functional theory calculation, we discover a novel form of spin-orbit (SO) splitting in two-dimensional (2D) heterostructures composed of a single Bi(111) bilayer stacking with a 2D semiconducting In₂Se₂ or a 2D ferroelectric α-In₂Se₃ layer. Such SO splitting has a Rashba-like but distinct spin texture in the valence band around the maximum, where the chirality of the spin texture reverses within the upper spin-split branch, in contrast to the conventional Rashba systems where the upper branch and lower branch have opposite chirality solely in the region below the band crossing point. The ferroelectric nature of α-In₂Se₃ further enables the tuning of the spin texture upon the reversal of the electric polarization with the application of an external electric field. Detailed analysis based on a tight-binding model reveals that such SO splitting texture results from the interplay of complex orbital characters and substrate interaction. This finding enriches the diversity of SO splitting systems and is also expected to promise for spintronic applications.

关键词: spin-orbit splitting, two-dimensional heterostructure, first-principles calculation

Abstract: Based on first-principles density functional theory calculation, we discover a novel form of spin-orbit (SO) splitting in two-dimensional (2D) heterostructures composed of a single Bi(111) bilayer stacking with a 2D semiconducting In₂Se₂ or a 2D ferroelectric α-In₂Se₃ layer. Such SO splitting has a Rashba-like but distinct spin texture in the valence band around the maximum, where the chirality of the spin texture reverses within the upper spin-split branch, in contrast to the conventional Rashba systems where the upper branch and lower branch have opposite chirality solely in the region below the band crossing point. The ferroelectric nature of α-In₂Se₃ further enables the tuning of the spin texture upon the reversal of the electric polarization with the application of an external electric field. Detailed analysis based on a tight-binding model reveals that such SO splitting texture results from the interplay of complex orbital characters and substrate interaction. This finding enriches the diversity of SO splitting systems and is also expected to promise for spintronic applications.

Key words: spin-orbit splitting, two-dimensional heterostructure, first-principles calculation

中图分类号: (Electron states at surfaces and interfaces)

73.20.-r

71.15.Mb (Density functional theory, local density approximation, gradient and other corrections) 71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)

Jianbao Zhu(朱健保), Wei Qin(秦维), and Wenguang Zhu(朱文光). Giant Rashba-like spin-orbit splitting with distinct spin texture in two-dimensional heterostructures[J]. 中国物理B, 2021, 30(8): 87307-087307.

Jianbao Zhu(朱健保), Wei Qin(秦维), and Wenguang Zhu(朱文光). Giant Rashba-like spin-orbit splitting with distinct spin texture in two-dimensional heterostructures[J]. Chin. Phys. B, 2021, 30(8): 87307-087307.

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Giant Rashba-like spin-orbit splitting with distinct spin texture in two-dimensional heterostructures

Giant Rashba-like spin-orbit splitting with distinct spin texture in two-dimensional heterostructures

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