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

作　　者：Jianbao Zhu Wei Qin Wenguang Zhu 朱健保;秦维;朱文光(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;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)

机构地区：[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

出　　处：《Chinese Physics B》2021年第8期485-491,共7页中国物理B（英文版）

基　　金：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);the Fundamental Research Funds for the Central Universities,China(Grant No.WK3510000013).

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 In_(2)Se_(2) or a 2D ferroelectricα-In_(2)Se_(3) 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 ofα-In_(2)Se_(3) 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 

分 类 号：O469[理学—凝聚态物理]