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Terahertz optical properties of multilayer graphene: Experimental observation of strong dependence on stacking arrangements and misorientation angles

机译:多层石墨烯的太赫兹光学性质:强烈依赖于堆叠排列和取向错误角度的实验观察

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摘要

The optical conductivity of monolayer and multilayer graphene in the terahertz spectral region is experimentally measured using terahertz time-domain spectroscopy. The stacking arrangement and the misorientation angle of each sample are determined by Raman spectroscopy. The chemical potential of each sample is measured using ultrafast midinfrared pump-probe spectroscopy to be 63 or 64 meV for all samples. The intraband scattering rate can be obtained by fitting the measured data with theoretical models. Other physical parameters, including carrier density, dc conductivity, and carrier mobility, of each sample can also be deduced from the theoretical fitting. The fitting results show the existence of misoriented or AA-stacked layers with an interaction energy of α_1 = 217 meV in our multilayer samples. Here we show that the scattering rate strongly depends on the stacking arrangement of the sample. High scattering rates and high optical conductivity are associated with AA-stacked samples, while lower ones are associated with misoriented multilayer graphene. This implies that the THz optoelectronic properties of multilayer graphene can be tuned by purposefully misorienting layers or employing different stacking schemes.
机译:使用太赫兹时域光谱法实验性地测量了太赫兹光谱区中单层和多层石墨烯的光导率。通过拉曼光谱法确定每个样品的堆叠布置和取向差角。使用超快中红外泵浦探针光谱法测得的每个样品的化学势为所有样品63或64 meV。可以通过将测量数据与理论模型拟合来获得带内散射率。每个样品的其他物理参数,包括载流子密度,直流电导率和载流子迁移率,也可以从理论拟合中得出。拟合结果表明,在我们的多层样品中,存在取向错误或AA堆叠的层,其相互作用能为α_1= 217 meV。在这里,我们表明散射率在很大程度上取决于样品的堆叠排列。高散射速率和高光导率与AA堆叠样品有关,而较低的散射率与取向不正确的多层石墨烯有关。这意味着可以通过故意错位层或采用不同的堆叠方案来调整多层石墨烯的太赫兹光电性能。

著录项

  • 来源
    《Physical review》 |2012年第23期|235446.1-235446.6|共6页
  • 作者单位

    Electrical Engineering Department, University of California, Los Angeles, Los Angeles, California 90095, USA;

    Electrical Engineering Department, University of California, Los Angeles, Los Angeles, California 90095, USA;

    Department of Electrophysics, National Chiao-Tung University, Hsinchu, Taiwan;

    Department of Electrophysics, National Chiao-Tung University, Hsinchu, Taiwan;

    Department of Electrophysics, National Chiao-Tung University, Hsinchu, Taiwan;

    Department of Electrophysics, National Chiao-Tung University, Hsinchu, Taiwan;

    Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan;

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  • 正文语种 eng
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  • 关键词

    high-frequency effects; plasma effects;

    机译:高频效果;等离子效应;

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