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Gate tunable optical absorption and band structure of twisted bilayer graphene

机译：扭曲双层石墨烯的栅极可调光吸收和能带结构

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摘要

We report the infrared transmission measurement on electrically gated twisted bilayer graphene. The optical absorption spectrum clearly manifests dramatic changes such as the splitting of the interlinear-band absorption step, the shift of the inter-van Hove singularity transition peak, and the emergence of a very strong intravalence (intraconduction) band transition. These anomalous optical behaviors demonstrate consistently a nonrigid band structure modification created by ion-gel gating through layer-dependent Coulomb screening. We propose that this screening-driven band modification is a universal phenomenon that persists to other bilayer crystals in general, establishing electrical gating as a versatile technique to engineer band structures and to create different types of optical absorptions that can be exploited in electro-optical device applications.
机译：我们报告了在电控扭曲双层石墨烯上的红外透射率测量。光学吸收光谱清楚地表明了急剧的变化，例如线性带间吸收步骤的分裂，范霍夫间奇异性跃迁峰的移动以及非常强的内价（跃迁）带跃迁的出现。这些异常的光学行为一致地证明了通过依赖于层的库仑筛选通过离子凝胶门控产生的非刚性带结构修饰。我们提出，这种由筛选驱动的能带修饰是普遍存在的现象，通常会持续存在于其他双层晶体中，从而将电门控作为一种通用技术来设计能带结构并创建可在电光设备中利用的不同类型的光吸收应用程序。

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  • 来源
    《Physical review》 |2019年第24期|241405.1-241405.6|共6页
  • 作者

    Yu Kwangnam; Nguyen Van Luan; Kim Taesoo; Jeon Jiwon; Kim Jiho; Moon Pilkyung; Lee Young Hee; Choi E. J.;

  • 作者单位

    Univ Seoul, Dept Phys, Seoul 130743, South Korea;

    Sungkyunkwan Univ, Ctr Integrated Nanostruct Phys, IBS, Suwon 16419, South Korea;

    Sungkyunkwan Univ, Ctr Integrated Nanostruct Phys, IBS, Suwon 16419, South Korea;

    Univ Seoul, Dept Phys, Seoul 130743, South Korea;

    Univ Seoul, Dept Phys, Seoul 130743, South Korea;

    New York Univ Shanghai, Shanghai, Peoples R China|NYU Shanghai, NYU ECNU Inst Phys, Shanghai, Peoples R China|NYU, Dept Phys, 4 Washington Pl, New York, NY 10003 USA|East China Normal Univ, State Key Lab Precis Spect, Shanghai, Peoples R China;

    Sungkyunkwan Univ, Ctr Integrated Nanostruct Phys, IBS, Suwon 16419, South Korea;

    Univ Seoul, Dept Phys, Seoul 130743, South Korea;

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