摘要翻译：
用分子动力学方法研究了具有多体相互作用和随机势的二维系统的速度自相关函数(VACF)的长时间行为。随着杂质密度的增加，随机势增强，VACF从正比于t^{-1}的正尾到正比于-t^{-2}的负尾的交叉行为。后一尾即使在粒子密度与杂质密度相同量级时也存在。研究了VACF在非平衡稳态下的行为。在线性响应区，其行为与平衡态相似，而在非线性响应区，其行为发生了剧烈的变化。
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英文标题：
《Long-Time Behavior of Velocity Autocorrelation Function for Interacting
  Particles in a Two-Dimensional Disordered System》
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作者：
Tatsuro Yuge, Akira Shimizu
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最新提交年份：
2008
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分类信息：

一级分类：Physics        物理学
二级分类：Statistical Mechanics        统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
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英文摘要：
  The long-time behavior of the velocity autocorrelation function (VACF) is investigated by the molecular dynamics simulation of a two-dimensional system which has both a many-body interaction and a random potential. With strengthening the random potential by increasing the density of impurities, a crossover behavior of the VACF is observed from a positive tail, which is proportional to t^{-1}, to a negative tail, proportional to -t^{-2}. The latter tail exists even when the density of particles is the same order as the density of impurities. The behavior of the VACF in a nonequilibrium steady state is also studied. In the linear response regime the behavior is similar to that in the equilibrium state, whereas it changes drastically in the nonlinear response regime.
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PDF链接：
https://arxiv.org/pdf/707.2689