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Effects of electrostatic fields and charge doping on the linear bands in twisted graphene bilayers

机译:静电场和电荷掺杂对扭曲石墨烯双层中线性带的影响

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摘要

A twisted graphene bilayer consists of two graphene monolayers rotated by an angle 8 with respect to each other. Theory predicts that charge-neutral twisted graphene bilayers display a drastic reduction of their Fermi velocity vF for 0 < θ < 20° and 40 < θ < 60°. In this paper we present evidence for an additional anisotropic reduction of vF in the presence of external electrostatic fields. We also discuss in quantitative detail velocity renormalization for other relevant bands in the vicinity of the K point. Except for a rigid energy shift, electrostatic fields and doping by metal atoms give rise to similar renormalization of the band structure of twisted graphene bilayers.
机译:扭曲的石墨烯双层由相对于彼此旋转角度8的两个石墨烯单层组成。理论预测,电荷中性扭曲的石墨烯双层在0 <θ<20°和40 <θ<60°时,其费米速度vF会急剧降低。在本文中,我们提供了在存在外部静电场的情况下vF各向异性进一步降低的证据。我们还定量讨论了K点附近其他相关波段的速度重新归一化。除了刚性的能量转移,静电场和金属原子的掺杂都会使扭曲的石墨烯双层的能带结构发生类似的重归一化。

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  • 来源
    《Physical review》 |2011年第7ptab期|p.075425.1-075425.6|共6页
  • 作者单位

    School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA;

    School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA;

    School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA,Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    multilayers;

    机译:多层;

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