中国物理B ›› 2018, Vol. 27 ›› Issue (11): 117102-117102.doi: 10.1088/1674-1056/27/11/117102

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

Antiferromagnetic–ferromagnetic transition in zigzag graphene nanoribbons induced by substitutional doping

Shenyuan Yang(杨身园), Jing Li(李静), Shu-Shen Li(李树深)   

  1. 1 State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
    2 School of Microelectronics, University of Chinese Academy of Sciences, Beijing 101408, China;
    3 College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 101408, China;
    4 Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
  • 收稿日期:2018-07-02 修回日期:2018-09-04 出版日期:2018-11-05 发布日期:2018-11-05
  • 通讯作者: Shenyuan Yang E-mail:syyang@semi.ac.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11474274 and 61427901) and the National Basic Research Program of China (Grant No. 2014CB643902).

Antiferromagnetic–ferromagnetic transition in zigzag graphene nanoribbons induced by substitutional doping

Shenyuan Yang(杨身园)1,2, Jing Li(李静)1, Shu-Shen Li(李树深)1,3,4   

  1. 1 State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
    2 School of Microelectronics, University of Chinese Academy of Sciences, Beijing 101408, China;
    3 College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 101408, China;
    4 Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
  • Received:2018-07-02 Revised:2018-09-04 Online:2018-11-05 Published:2018-11-05
  • Contact: Shenyuan Yang E-mail:syyang@semi.ac.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11474274 and 61427901) and the National Basic Research Program of China (Grant No. 2014CB643902).

摘要:

Using first-principles calculations based on density functional theory, we show that the ground state of zigzag-edged graphene nanoribbons (ZGNRs) can be transformed from antiferromagnetic (AFM) order to ferromagnetic (FM) order by changing the substitutional sites of N or B dopants. This AFM-FM transition induced by substitutional sites is found to be a consequence of the competition between the edge and bulk states. The energy sequence of the edge and bulk states near the Fermi level is reversed in the AFM and FM configurations. When the dopant is substituted near the edge of the ribbon, the extra charge from the dopant is energetically favorable to occupy the edge states in AFM configuration. When the dopant is substituted near the center, the extra charge is energetically favorable to occupy the bulk states in FM configuration. Proper substrate with weak interaction is necessary to maintain the magnetic properties of the doped ZGNRs. Our study can serve as a guide to synthesize graphene nanostructures with stable FM order for future applications to spintronic devices.

关键词: graphene nanoribbon, substitutional doping, magnetic order, first-principles calculation

Abstract:

Using first-principles calculations based on density functional theory, we show that the ground state of zigzag-edged graphene nanoribbons (ZGNRs) can be transformed from antiferromagnetic (AFM) order to ferromagnetic (FM) order by changing the substitutional sites of N or B dopants. This AFM-FM transition induced by substitutional sites is found to be a consequence of the competition between the edge and bulk states. The energy sequence of the edge and bulk states near the Fermi level is reversed in the AFM and FM configurations. When the dopant is substituted near the edge of the ribbon, the extra charge from the dopant is energetically favorable to occupy the edge states in AFM configuration. When the dopant is substituted near the center, the extra charge is energetically favorable to occupy the bulk states in FM configuration. Proper substrate with weak interaction is necessary to maintain the magnetic properties of the doped ZGNRs. Our study can serve as a guide to synthesize graphene nanostructures with stable FM order for future applications to spintronic devices.

Key words: graphene nanoribbon, substitutional doping, magnetic order, first-principles calculation

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

  • 71.15.Mb
73.22.Pr (Electronic structure of graphene) 75.75.-c (Magnetic properties of nanostructures)