中国物理B ›› 2013, Vol. 22 ›› Issue (8): 87303-087303.doi: 10.1088/1674-1056/22/8/087303

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Spin gapless armchair graphene nanoribbons under magnetic field and uniaxial strain

侯海平a b, 谢月娥a b, 陈元平a b, 欧阳滔a b, 葛青霞a b, 钟建新a b   

  1. a Hunan Key Laboratory for Micro-Nano Energy Materials and Devices, Xiangtan University, Xiangtan 411105, China;
    b Laboratory for Quantum Engineering and Micro-Nano Energy Technology and Faculty of Materials and Optoelectronic Physics, Xiangtan University, Xiangtan 411105, China
  • 收稿日期:2012-11-05 修回日期:2013-01-29 出版日期:2013-06-27 发布日期:2013-06-27
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No. 2012CB921303), the National Natural Science Foundation of China (Grant Nos. 51172191, 11074211, 11074213, 51006086, and 51176161), and the Joint Funds of the Natural Science Foundation of Hunan Province, China (Grant No. 10JJ9001).

Spin gapless armchair graphene nanoribbons under magnetic field and uniaxial strain

Hou Hai-Ping (侯海平)a b, Xie Yue-E (谢月娥)a b, Chen Yuan-Ping (陈元平)a b, Ouyang Tao (欧阳滔)a b, Ge Qing-Xia (葛青霞)a b, Zhong Jian-Xin (钟建新)a b   

  1. a Hunan Key Laboratory for Micro-Nano Energy Materials and Devices, Xiangtan University, Xiangtan 411105, China;
    b Laboratory for Quantum Engineering and Micro-Nano Energy Technology and Faculty of Materials and Optoelectronic Physics, Xiangtan University, Xiangtan 411105, China
  • Received:2012-11-05 Revised:2013-01-29 Online:2013-06-27 Published:2013-06-27
  • Contact: Xie Yue-E, Zhong Jian-Xin E-mail:xieyech@xtu.edu.cn; jxzhong@xtu.edu.cn
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No. 2012CB921303), the National Natural Science Foundation of China (Grant Nos. 51172191, 11074211, 11074213, 51006086, and 51176161), and the Joint Funds of the Natural Science Foundation of Hunan Province, China (Grant No. 10JJ9001).

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摘要： Using Green's function method, we investigate the spin transport properties of armchair graphene nanoribbons (AGNRs) under magnetic field and uniaxial strain. Our results show that it is very difficult to transform narrow AGNRs directly from semiconductor to spin gapless semiconductors (SGS) by applying magnetic fields. However, as a uniaxial strain is exerted on the nanoribbons, the AGNRs can transform to SGS by a small magnetic field. The combination mode between magnetic field and uniaxial strain displays a nonmonotonic arch-pattern relationship. In addition, we find that the combination mode is associated with the widths of nanoribbons, which exhibits group behaviors.

关键词: graphene, spin gapless, spin transport, tight-binding

Abstract: Using Green's function method, we investigate the spin transport properties of armchair graphene nanoribbons (AGNRs) under magnetic field and uniaxial strain. Our results show that it is very difficult to transform narrow AGNRs directly from semiconductor to spin gapless semiconductors (SGS) by applying magnetic fields. However, as a uniaxial strain is exerted on the nanoribbons, the AGNRs can transform to SGS by a small magnetic field. The combination mode between magnetic field and uniaxial strain displays a nonmonotonic arch-pattern relationship. In addition, we find that the combination mode is associated with the widths of nanoribbons, which exhibits group behaviors.

Key words: graphene, spin gapless, spin transport, tight-binding

中图分类号:  (Electronic transport in nanoscale materials and structures)

  • 73.63.-b
85.75.-d (Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields) 85.35.-p (Nanoelectronic devices)