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Strain and curvature induced evolution of electronic band structures in twisted graphene bilayer

Author

Listed:
  • Wei Yan

    (Beijing Normal University)

  • Wen-Yu He

    (Beijing Normal University)

  • Zhao-Dong Chu

    (Beijing Normal University)

  • Mengxi Liu

    (Center for Nanochemistry (CNC), College of Chemistry and Molecular Engineering, Peking University)

  • Lan Meng

    (Beijing Normal University)

  • Rui-Fen Dou

    (Beijing Normal University)

  • Yanfeng Zhang

    (Center for Nanochemistry (CNC), College of Chemistry and Molecular Engineering, Peking University
    College of Engineering, Peking University)

  • Zhongfan Liu

    (Center for Nanochemistry (CNC), College of Chemistry and Molecular Engineering, Peking University)

  • Jia-Cai Nie

    (Beijing Normal University)

  • Lin He

    (Beijing Normal University)

Abstract

It is well established that strain and geometry could affect the band structure of graphene monolayer dramatically. Here we study the evolution of local electronic properties of a twisted graphene bilayer induced by a strain and a high curvature, which are found to strongly affect the local band structures of the twisted graphene bilayer. The energy difference of the two low-energy van Hove singularities decreases with increasing lattice deformation and the states condensed into well-defined pseudo-Landau levels, which mimic the quantization of massive chiral fermions in a magnetic field of about 100 T, along a graphene wrinkle. The joint effect of strain and out-of-plane distortion in the graphene wrinkle also results in a valley polarization with a significant gap. These results suggest that strained graphene bilayer could be an ideal platform to realize the high-temperature zero-field quantum valley Hall effect.

Suggested Citation

  • Wei Yan & Wen-Yu He & Zhao-Dong Chu & Mengxi Liu & Lan Meng & Rui-Fen Dou & Yanfeng Zhang & Zhongfan Liu & Jia-Cai Nie & Lin He, 2013. "Strain and curvature induced evolution of electronic band structures in twisted graphene bilayer," Nature Communications, Nature, vol. 4(1), pages 1-7, October.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3159
    DOI: 10.1038/ncomms3159
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