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Chin. Phys. B, 2021, Vol. 30(8): 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
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.
Keywords:  spin-orbit splitting      two-dimensional heterostructure      first-principles calculation  
Received:  02 May 2021      Revised:  27 May 2021      Accepted manuscript online:  03 June 2021
PACS:  73.20.-r (Electron states at surfaces and interfaces)  
  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)  
Fund: 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).
Corresponding Authors:  Wenguang Zhu     E-mail:

Cite this article: 

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 2021 Chin. Phys. B 30 087307

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