Chin. Phys. B ›› 2014, Vol. 23 ›› Issue (1): 17202-017202.doi: 10.1088/1674-1056/23/1/017202

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

Resonant tunneling through double-barrier structures on graphene

邓伟胤a, 朱瑞a, 肖运昌b, 邓文基a   

  1. a Department of Physics, South China University of Technology, Guangzhou 510640, China;
    b LQIT, ICMP and SPTE, South China Normal University, Guangzhou 510006, China
  • 收稿日期:2013-07-05 修回日期:2013-08-06 出版日期:2013-11-12 发布日期:2013-11-12
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11004063) and the Fundamental Research Funds for the Central Universities, China (Grant No. 2012ZZ0076).

Resonant tunneling through double-barrier structures on graphene

Deng Wei-Yin (邓伟胤)a, Zhu Rui (朱瑞)a, Xiao Yun-Chang (肖运昌)b, Deng Wen-Ji (邓文基)a   

  1. a Department of Physics, South China University of Technology, Guangzhou 510640, China;
    b LQIT, ICMP and SPTE, South China Normal University, Guangzhou 510006, China
  • Received:2013-07-05 Revised:2013-08-06 Online:2013-11-12 Published:2013-11-12
  • Contact: Deng Wen-Ji E-mail:phwjdeng@scut.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11004063) and the Fundamental Research Funds for the Central Universities, China (Grant No. 2012ZZ0076).

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摘要： Quantum resonant tunneling behaviors of double-barrier structures on graphene are investigated under the tight-binding approximation. The Klein tunneling and resonant tunneling are demonstrated for the quasiparticles with energy close to the Dirac points. The Klein tunneling vanishes by increasing the height of the potential barriers to more than 300 meV. The Dirac transport properties continuously change to the Schrödinger ones. It is found that the peaks of resonant tunneling approximate to the eigen-levels of graphene nanoribbons under appropriate boundary conditions. A comparison between the zigzag- and armchair-edge barriers is given.

关键词: graphene, tight-binding approximation, resonant tunneling

Abstract: Quantum resonant tunneling behaviors of double-barrier structures on graphene are investigated under the tight-binding approximation. The Klein tunneling and resonant tunneling are demonstrated for the quasiparticles with energy close to the Dirac points. The Klein tunneling vanishes by increasing the height of the potential barriers to more than 300 meV. The Dirac transport properties continuously change to the Schrödinger ones. It is found that the peaks of resonant tunneling approximate to the eigen-levels of graphene nanoribbons under appropriate boundary conditions. A comparison between the zigzag- and armchair-edge barriers is given.

Key words: graphene, tight-binding approximation, resonant tunneling

中图分类号:  (Electronic transport in graphene)

  • 72.80.Vp
73.23.Ad (Ballistic transport) 73.40.Gk (Tunneling)