Coexistence of giant Rashba spin splitting and quantum spin Hall effect in H–Pb–F  

作　　者：薛文明 李金 何朝宇 欧阳滔 戴雄英 钟建新 Wenming Xue;Jin Li;Chaoyu He;Tao Ouyang;Xiongying Dai;Jianxin Zhong(School of Computational Science and Electronics,Hunan Institute of Engineering,Xiangtan 411104,China;School of Physics and Optoelectronics Engineering,Xiangtan University,Xiangtan 411105,China)

机构地区：[1]School of Computational Science and Electronics,Hunan Institute of Engineering,Xiangtan 411104,China [2]School of Physics and Optoelectronics Engineering,Xiangtan University,Xiangtan 411105,China

出　　处：《Chinese Physics B》2023年第3期414-418,共5页中国物理B（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.11874316,11404275,and 11474244);the National Basic Research Program of China(Grant No.2015CB921103);the Natural Science Foundation of Hunan Province,China(Grant Nos.2016JJ3118 and 2020JJ4244);the Scientific Research Foundation of the Education Bureau of Hunan Province,China(Grant Nos.16K084,17K086,and 21A049);the Fund for the Innovative Research Team in University(Grant No.IRT13093).

摘　　要：Rashba spin splitting(RSS)and quantum spin Hall effect(QSHE)have attracted enormous interest due to their great significance in the application of spintronics.In this work,we theoretically proposed a new two-dimensional(2D)material H–Pb–F with coexistence of giant RSS and quantum spin Hall effec by using the ab initio calculations.Our results show that H–Pb–F possesses giant RSS(1.21 eV·A)and the RSS can be tuned up to 4.16 e V·A by in-plane biaxial strain,which is a huge value among 2D materials.Furthermore,we also noticed that H–Pb–F is a 2D topological insulator(TI)duo to the strong spin–orbit coupling(SOC)interaction,and the large topological gap is up to 1.35 e V,which is large enough for for the observation of topological edge states at room temperature.The coexistence of giant RSS and quantum spin Hall effect greatly broadens the potential application of H–Pb–F in the field of spintronic devices.

关 键 词：COEXISTENCE Rashba spin splitting quantum spin Hall effect spin–orbit coupling 

分 类 号：O469[理学—凝聚态物理]