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Optical and photogalvanic properties of graphene superlattices formed by periodic strain

机译:周期性应变形成的石墨烯超晶格的光学和光电流特性

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摘要

Graphene superlattices formed by periodic strain are considered theoretically. It is shown that an electron energy spectrum consists of minibands obtained by folding of the cone at the boundaries of the superlattice Brillouin zone with very narrow anticrossing regions. Light absorption under direct interminiband transitions is shown to be frequency dependent and dichroic. Giant dichroism of absorption is demonstrated for doped graphene superlattices. Asymmetrical graphene superlattices act as quantum ratchets allowing for the generation of photocurrents at absorption of normally incident light. The helicity-dependent photocurrent spectrum is calculated for doped superlattices with various asymmetries.
机译:理论上考虑了由周期性应变形成的石墨烯超晶格。结果表明,电子能谱由在超晶格布里渊区的边界处具有非常窄的反交叉区域的锥折叠而得到的微带组成。在直接的小带间跃迁下的光吸收被证明是频率依赖性和二向色性的。掺杂的石墨烯超晶格显示出巨大的吸收二色性。不对称石墨烯超晶格充当量子棘轮,允许在吸收正常入射光时产生光电流。对于具有各种不对称性的掺杂超晶格,计算了依赖于螺旋度的光电流谱。

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  • 来源
    《Physical review》 |2011年第23期|p.235440.1-235440.6|共6页
  • 作者

    Yu. Yu. Kiselev; L. E. Golub;

  • 作者单位

    Ioffe Physical-Technical Institute of the Russian Academy of Sciences, 194021 St. Petersburg, Russia;

    Ioffe Physical-Technical Institute of the Russian Academy of Sciences, 194021 St. Petersburg, Russia;

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

    Superlattices; photoconduction and photovoltaic effects;

    机译:超晶格光电导和光电效应;

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