低维无序材料晶格热导率的广义Debye-Peierls/Allen-Feldman模型
A generalized Debye-Peierls/Allen-Feldman model for the lattice thermal conductivity of low dimensional and disordered materials
摘要：
我们提出了一个广义模型来描述低维（低维）和无序系统的晶格热导率。该模型是Debye-Peierls和Allen-Feldman方案到任意维度的简单概括，考虑了低D效应，如色散、态密度和散射的差异。与艾伦-费尔德曼方法的精神相似，热载体根据其传输能力分为传播体、扩散体和局部体。广义模型的结果进行比较，实验结果时，否则平衡分子动力学模拟。这些结果与我们对无序低维系统（如无定形石墨烯和玻璃状金刚石纳米线）中声子局域化的分析非常一致。在低维和无序系统的热传输，如温和的抑制热导率和不稳定的扩散贡献，几个独特的方面，被捕获的方法。
英文摘要：
We present a generalized model to describe the lattice thermal conductivity of low-dimensional (low-D) and disordered systems. The model is a straightforward generalization of the Debye-Peierls and Allen-Feldman schemes to arbitrary dimensions, accounting for low-D effects such as differences in dispersion, density of states, and scattering. Similar in spirit to the Allen-Feldman approach, heat carriers are categorized according to their transporting capacity as propagons, diffusons, and locons. The results of the generalized model are compared to experimental results when available, and equilibrium molecular dynamics simulations otherwise. The results are in very good agreement with our analysis of phonon localization in disordered low-D systems, such as amorphous graphene and glassy diamond nanothreads. Several unique aspects of thermal transport in low-D and disordered systems, such as milder suppression of thermal conductivity and negligble diffuson contributions, are captured by the approach.
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