中国物理B ›› 2023, Vol. 32 ›› Issue (3): 37101-037101.doi: 10.1088/1674-1056/aca7eb

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

Wenming Xue(薛文明)1,†, Jin Li(李金)2,‡, Chaoyu He(何朝宇)2, Tao Ouyang(欧阳滔)2, Xiongying Dai(戴雄英)1, and Jianxin Zhong(钟建新)2   

  1. 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
  • 收稿日期:2022-09-23 修回日期:2022-11-16 接受日期:2022-12-02 出版日期:2023-02-14 发布日期:2023-02-21
  • 通讯作者: Wenming Xue, Jin Li E-mail:xuewm@hnie.edu.cn;lijin@xtu.edu.cn
  • 基金资助:
    Project supported by 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), and the Fund for the Innovative Research Team in University (Grant No. IRT13093).

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

Wenming Xue(薛文明)1,†, Jin Li(李金)2,‡, Chaoyu He(何朝宇)2, Tao Ouyang(欧阳滔)2, Xiongying Dai(戴雄英)1, and Jianxin Zhong(钟建新)2   

  1. 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
  • Received:2022-09-23 Revised:2022-11-16 Accepted:2022-12-02 Online:2023-02-14 Published:2023-02-21
  • Contact: Wenming Xue, Jin Li E-mail:xuewm@hnie.edu.cn;lijin@xtu.edu.cn
  • Supported by:
    Project supported by 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), and 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·Å) and the RSS can be tuned up to 4.16 eV·Å 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 eV, 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

Abstract: 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·Å) and the RSS can be tuned up to 4.16 eV·Å 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 eV, 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.

Key words: coexistence, Rashba spin splitting, quantum spin Hall effect, spin-orbit coupling

中图分类号:  (Density functional theory, local density approximation, gradient and other corrections)

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73.20.-r (Electron states at surfaces and interfaces) 73.21.-b (Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems) 73.90.+f (Other topics in electronic structure and electrical properties of surfaces, interfaces, thin films, and low-dimensional structures)