Anomalous and non-Gaussian diffusion in Hertzian spheres
Anomalous and non-Gaussian diffusion in Hertzian spheres
复制标题
赫兹球内的反常和非高斯扩散
DOI：
10.1016/j.physa.2018.03.034
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发表时间：
2018-09
期刊：
影响因子：
--
通讯作者：
Shenghua Xu
中科院分区：
文献类型：
--
作者：
Wenze Ouyang;Bin Sun;Zhiwei Sun;Shenghua Xu
By means of molecular dynamics simulations, we study the non-Gaussian diffusion in the fluid of Hertzian spheres. The time dependent non-Gaussian parameter, as an indicator of the dynamic heterogeneity, is increased with the increasing of temperature. When the temperature is high enough, the dynamic heterogeneity becomes very significant, and it seems counterintuitive that the maximum of non-Gaussian parameter and the position of its peak decrease monotonically with the increasing of density. By fitting the curves of self intermediate scattering function, we find that the character relaxation time τ α is surprisingly not coupled with the time τ m a x where the non-Gaussian parameter reaches to a maximum. The intriguing features of non-Gaussian diffusion at high enough temperatures can be associated with the weakly correlated mean-field behavior of Hertzian spheres. Especially the time τ m a x is nearly inversely proportional to the density at extremely high temperatures.
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DOI：
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