中国物理B ›› 2023, Vol. 32 ›› Issue (8): 87104-087104.doi: 10.1088/1674-1056/accff1

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Highly anisotropic Dirac fermion and spin transportproperties in Cu-graphane

Chao Wu(吴超)1,2, Lichuan Zhang(张礼川)1,2,†, Lin Xia(夏霖)1,2, Dong Hao(郝东)1,2, Shiqi Li(李仕琪)1,2, Lizhi Zhang(张礼智)3, Yuee Xie(谢月娥)1,2,‡, and Yuanping Chen(陈元平)1,2   

  1. 1. School of Physics and Electronic Engineering, Jiangsu University, Zhenjiang 212013, China;
    2. Jiangsu Engineering Research Center on Quantum Perception and Intelligent, Detection of Agricultural Information, Zhenjiang 212013, China;
    3. National Center for Nanoscience and Technology of China, Beijing 100190, China
  • 收稿日期:2023-03-12 修回日期:2023-04-20 接受日期:2023-04-25 发布日期:2023-07-27
  • 通讯作者: Lichuan Zhang, Yuee Xie E-mail:Lichuan.zhang@ujs.edu.cn;yueex@ujs.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos.12074150, 12174157, 12174158, and 11874314), the Innovation and Entrepreneurship Talent Project of Jiangsu Province of China, the Scientific Research Startup of Jiangsu University (Grant No.5501710001), and the College Students' Innovation Training Program of Jiangsu Province of China (Grant No.202110299123Y).

Highly anisotropic Dirac fermion and spin transportproperties in Cu-graphane

Chao Wu(吴超)1,2, Lichuan Zhang(张礼川)1,2,†, Lin Xia(夏霖)1,2, Dong Hao(郝东)1,2, Shiqi Li(李仕琪)1,2, Lizhi Zhang(张礼智)3, Yuee Xie(谢月娥)1,2,‡, and Yuanping Chen(陈元平)1,2   

  1. 1. School of Physics and Electronic Engineering, Jiangsu University, Zhenjiang 212013, China;
    2. Jiangsu Engineering Research Center on Quantum Perception and Intelligent, Detection of Agricultural Information, Zhenjiang 212013, China;
    3. National Center for Nanoscience and Technology of China, Beijing 100190, China
  • Received:2023-03-12 Revised:2023-04-20 Accepted:2023-04-25 Published:2023-07-27
  • Contact: Lichuan Zhang, Yuee Xie E-mail:Lichuan.zhang@ujs.edu.cn;yueex@ujs.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos.12074150, 12174157, 12174158, and 11874314), the Innovation and Entrepreneurship Talent Project of Jiangsu Province of China, the Scientific Research Startup of Jiangsu University (Grant No.5501710001), and the College Students' Innovation Training Program of Jiangsu Province of China (Grant No.202110299123Y).

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摘要： Inspired by the successful synthesis of hHv-graphane [Nano Lett. 15 903 (2015)], a new two-dimensional (2D) Janus material Cu-graphane is proposed based on the first-principles calculations. Without the spin-orbit coupling (SOC) effect, Cu-graphane is a Dirac semimetal with a highly anisotropic Dirac cone, whose Fermi velocity ranges from 0.12×105 m/s to 2.9×105 m/s. The Dirac cone near the Fermi level can be well described with an extended 2D Dirac model Hamiltonian. In the presence of the SOC effect, band splitting is observed around the Fermi level, and a large intrinsic spin Hall conductivity (ISHC) with a maximum value of 346 (ħ/e) S/cm is predicted. Moreover, the spin Hall transport can be regulated by slightly adjusting the Fermi energy, e.g., grid voltage or chemical doping. Our work not only proposes a new 2D Janus material with a highly anisotropic Dirac cone and a large ISHC, but also reveals that a large ISHC may exist in some Dirac systems.

关键词: graphane, anisotropic Dirac fermion, Janus, spin Hall effect

Abstract: Inspired by the successful synthesis of hHv-graphane [Nano Lett. 15 903 (2015)], a new two-dimensional (2D) Janus material Cu-graphane is proposed based on the first-principles calculations. Without the spin-orbit coupling (SOC) effect, Cu-graphane is a Dirac semimetal with a highly anisotropic Dirac cone, whose Fermi velocity ranges from 0.12×105 m/s to 2.9×105 m/s. The Dirac cone near the Fermi level can be well described with an extended 2D Dirac model Hamiltonian. In the presence of the SOC effect, band splitting is observed around the Fermi level, and a large intrinsic spin Hall conductivity (ISHC) with a maximum value of 346 (ħ/e) S/cm is predicted. Moreover, the spin Hall transport can be regulated by slightly adjusting the Fermi energy, e.g., grid voltage or chemical doping. Our work not only proposes a new 2D Janus material with a highly anisotropic Dirac cone and a large ISHC, but also reveals that a large ISHC may exist in some Dirac systems.

Key words: graphane, anisotropic Dirac fermion, Janus, spin Hall effect

中图分类号:  (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)

  • 71.70.Ej
72.25.-b (Spin polarized transport) 73.22.-f (Electronic structure of nanoscale materials and related systems) 81.05.Zx (New materials: theory, design, and fabrication)