Tunable and Sizable Band Gap of Single Layer Graphene Sandwiched between Hexagonal Boron Nitride

ORAL

Abstract

It is a big challenge to open a tunable and sizable band gap of single layer graphene without big loss in structural integrity and carrier mobility. By using density functional theory calculations, we show that the band gap of single layer graphene can be opened to 0.16 (without electrical field) and 0.34 eV (with a strong electrical field) when sandwiched between two hexagonal boron nitride single layers in a proper way. The zero-field band gaps are increased by about 50{\%} when many-body effects are included. Ab initio quantum transport simulation of a dual-gated FET out of such a sandwich structure further confirms an electrical field-enhanced transport gap. The tunable and sizeable band gap and structural integrity render this sandwich structure a promising candidate for high-performance single layer graphene field effect transistors.

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Authors

  • Jiaxin Zheng

    State Key Laboratory of Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, P. R. China, State Key Laboratory of Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China

  • Heruge Qu

    State Key Laboratory of Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China

  • Qihang Liu

    State Key Laboratory of Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China

  • Rui Qin

    State Key Laboratory of Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China

  • Jing Zhou

    State Key Laboratory of Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China

  • Dapeng Yu

    State Key Laboratory for Mesoscopic Physics, and Electron Microscopy Laboratory, Department of Physics, Peking University, Beijing 100871, P.R.China, State Key Laboratory of Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, P. R. China, State Key Laboratory of Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China

  • Zhengxiang Gao

    State Key Laboratory of Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, P. R. China, State Key Laboratory of Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China

  • Jing Lu

    Peking University, Beijing, P.R. China, State Key Laboratory of Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, P. R. China, State Key Laboratory of Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China

  • Guangfu Luo

    Department of Theoretical and Computational Molecular Science, Institute for Molecular Science, Okazaki 444-8585, Japan

  • Shigeru Nagase

    Department of Theoretical and Computational Molecular Science, Institute for Molecular Science, Okazaki 444-8585, Japan

  • Wai-Ning Mei

    University of Nebraska at Omaha, Department of Physics, University of Nebraska at Omaha, Omaha, Nebraska 68182-0266, USA, Department of Physics, University of Nebraska at Omaha, Omaha, NE 68182-0266, USA