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Electron localization in metal-decorated graphene

机译:金属修饰石墨烯中的电子定位

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摘要

By decorating single-layer graphene with disordered noble metal (Ag, Au, and Ft) clusters, we investigated experimentally the influence of strong random scatterings on graphene transport and electron-localization phenomena. As evidenced by micro-Raman scattering, there is a strong interction between the metal clusters and graphene. We found that such a strong interaction was the consequence of plasma-assisted decoration of the graphene by the metal clusters. A large negative magnetoresistance (MR) effect (up to 80% at 12 T) was observed and fitted using different models. The structure, size, and area density of metal clusters were characterized by scanning tunneling microscopy and transmission electron microscopy. The samples with a high concentration of scattering centers behaved as insulators at low temperatures and showed strong localization (SL) effects. Their temperature-dependent conductance was in accordance with the two-dimensional variable-range hopping (VRH) mechanism. The localization lengths and density of states were estimated and discussed.
机译:通过用无序的贵金属(Ag,Au和Ft)簇装饰单层石墨烯,我们实验研究了强随机散射对石墨烯输运和电子定位现象的影响。如微拉曼散射所证明的,在金属团簇和石墨烯之间有很强的交集。我们发现这种强烈的相互作用是金属簇通过等离子体辅助装饰石墨烯的结果。观察到较大的负磁阻(MR)效应(在12 T时高达80%),并使用不同的模型进行拟合。通过扫描隧道显微镜和透射电子显微镜对金属团簇的结构,尺寸和面积密度进行了表征。具有高散射中心浓度的样品在低温下充当绝缘体,并表现出强烈的局部化(SL)效应。它们的温度依赖性电导符合二维可变范围跳变(VRH)机制。估计并讨论了定位长度和状态密度。

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  • 来源
    《Physical review》 |2011年第4期|p.045431.1-045431.8|共8页
  • 作者单位

    William Mong Institute of Nano Science and Technology, Hong Kong University of Science and Technology, Hong Kong, China;

    Department of Physics, Hong Kong University of Science and Technology, Hong Kong, China,;

    Department of Physics, Hong Kong University of Science and Technology, Hong Kong, China,;

    Department of Physics, Shanghai Jiaotong University, Shanghai, China;

    Department of Physics, Hong Kong University of Science and Technology, Hong Kong, China,;

    William Mong Institute of Nano Science and Technology, Hong Kong University of Science and Technology, Hong Kong, China,Department of Physics, Hong Kong University of Science and Technology, Hong Kong, China,;

    William Mong Institute of Nano Science and Technology, Hong Kong University of Science and Technology, Hong Kong, China,Department of Physics, Hong Kong University of Science and Technology, Hong Kong, China,;

    William Mong Institute of Nano Science and Technology, Hong Kong University of Science and Technology, Hong Kong, China,Department of Physics, Hong Kong University of Science and Technology, Hong Kong, China;

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

    weak or anderson localization;

    机译:弱或安德森本地化;

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