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Triggering waves in nonlinear lattices: Quest for anharmonic phonons and corresponding mean-free paths

机译:触发非线性晶格中的波:寻求非谐声子和相应的无均值路径

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摘要

Guided by a stylized experiment we develop a self-consistent anharmonic phonon concept for nonlinear lattices which allows for explicit "visualization." The idea uses a small external driving force which excites the front particles in a nonlinear lattice slab and subsequently one monitors the excited wave evolution using molecular dynamics simulations. This allows for a simultaneous, direct determination of the existence of the phonon mean-free path with its corresponding anharmonic phonon wave number as a function of temperature. The concept for the mean-free path is very distinct from known prior approaches: the latter evaluate the mean-free path only indirectly, via using both a scale for for the phonon relaxation time and yet another one for the phonon velocity. Notably, the concept here is neither limited to small lattice nonlinearities nor to small frequencies. The scheme is tested for three strongly nonlinear lattices of timely current interest which either exhibit normal or anomalous heat transport.
机译:在程式化实验的指导下,我们为非线性晶格开发了自洽非谐声子概念,从而实现了明确的“可视化”。这个想法使用了很小的外部驱动力,该驱动力激发了非线性晶格板中的前粒子,随后又使用分子动力学模拟来监测激发波的演化。这允许同时直接确定声子自由平均路径的存在及其对应的非谐声子波数随温度的变化。无均值路径的概念与已知的现有方法非常不同:后者仅通过使用一个用于声子弛豫时间的标度和另一个用于声子速度的标尺来间接评估该平均路径。值得注意的是,这里的概念既不限于小的晶格非线性,也不限于小的频率。该方案针对及时电流感兴趣的三个强非线性晶格进行了测试,这些晶格表现出正常或异常的热传输。

著录项

  • 来源
    《Physical review》 |2014年第17期|174304.1-174304.7|共7页
  • 作者单位

    Department of Physics and Centre for Computational Science and Engineering, National University of Singapore, 117546 Singapore,NUS Graduate School for Integrative Sciences and Engineering, 117456 Singapore;

    Department of Physics and Centre for Computational Science and Engineering, National University of Singapore, 117546 Singapore,State Key Laboratory of Surface Physics and Department of Physics, Fudan University, 200433 Shanghai, China;

    Department of Physics and Centre for Computational Science and Engineering, National University of Singapore, 117546 Singapore,Institute of Physics, University of Augsburg, Universitaetsstr. 1, D-86159 Augsburg, Germany,Nanosystems Initiative Munich, Schellingstr. 4, D-80799 Muenchen, Germany,Center for Phononics and Thermal Energy Science, School of Physics Science and Engineering, Tongji University, 200092 Shanghai, China;

    State Key Laboratory of Surface Physics and Department of Physics, Fudan University, 200433 Shanghai, China;

    Department of Physics and Centre for Computational Science and Engineering, National University of Singapore, 117546 Singapore,NUS Graduate School for Integrative Sciences and Engineering, 117456 Singapore,Center for Phononics and Thermal Energy Science, School of Physics Science and Engineering, Tongji University, 200092 Shanghai, China,Graphene Research Centre, Faculty of Science, National University of Singapore, 117542 Singapore;

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

    anharmonic lattice modes; classical transport;

    机译:非调和晶格模式古典运输;

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