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Model of ripples in graphene

机译:石墨烯中的波纹模型

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摘要

We propose a model of ripples in suspended graphene sheets based on plate equations that are made discrete with the periodicity of the honeycomb lattice and then periodized. In addition, the equation for the displacements with respect to the planar configuration contains a double-well site potential, a nonlinear friction, and a multiplicative white-noise term satisfying the fluctuation-dissipation theorem. The nonlinear friction terms agree with those proposed by Eichleref al. [Nature Nanotech. 6,339 (2011 )] to explain their experiments with a graphene resonator. The site double-well potential indicates that the carbon atoms at each lattice point have equal probability to move upward or downward off plane. For the considered parameter values, the relaxation time due to friction is much larger than the periods of membrane vibrations and the noise is quite small. Then ripples with no preferred orientation appear as long-lived metastable states for any temperature. Numerical solutions confirm this picture.
机译:我们基于板方程提出了悬浮石墨烯片中的波纹模型,该模型随蜂窝晶格的周期性而离散,然后周期性化。另外,相对于平面结构的位移方程式包含一个双阱位势,一个非线性摩擦和一个满足涨落耗散定理的乘性白噪声项。非线性摩擦项与Eichleref等人提出的项一致。 [自然纳米技术。 6,339(2011)]解释了他们使用石墨烯谐振器的实验。现场双阱电势表明在每个晶格点处的碳原子具有相等的向上或向下移动平面的可能性。对于所考虑的参数值,由于摩擦引起的弛豫时间远大于膜片振动的周期,并且噪声非常小。然后,在任何温度下,没有首选方向的波纹都将显示为长寿命的亚稳态。数值解证实了这一情况。

著录项

  • 来源
    《Physical review》 |2012年第19期|195402.1-195402.8|共8页
  • 作者

    L. L. Bonilla; A. Carpio;

  • 作者单位

    G. Milldn Institute, Fluid Dynamics, Nanoscience and Industrial Mathematics, Univcrsidad Carlos III de Madrid, Avda. Universidad 30, E-28911 Lexemes, Spain;

    Departmento de Matemdtica Aplicada, Universidad Complitlense de Madrid, E-2H040 Madrid, Spain;

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

    specific phase transitions;

    机译:具体的相变;

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