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arXiv 0911.0213cond-mat.soft
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过冷流体中中间时间尺度上流度的结构特征

Structural signatures of mobility on intermediate time scales in a supercooled fluid

William P. Krekelberg, Venkat Ganesan, Thomas M. Truskett

摘要:

我们使用计算机模拟来探索的方式,在过冷流体中的中间时间尺度上的粒子位移相关的动态结构环境。我们研究的流体是硬球的二元混合物,表现出动态不均匀性的经典特征,包括分叉的单粒子位移分布(即,固定和移动粒子的亚群)。我们发现,不动的粒子,在他们的位移过程中,表现出更强的平均对相关性,他们的邻居比移动粒子,但不一定更高的平均配位数。我们讨论了结构和单粒子动力学之间的相关性如何取决于观测时间。

英文摘要:

We use computer simulations to explore the manner in which the particle displacements on intermediate time scales in supercooled fluids correlate to their dynamic structural environment. The fluid we study, a binary mixture of hard spheres, exhibits classic signatures of dynamic heterogeneity, including a bifurcated single-particle displacement distribution (i.e., subpopulations of immobile and mobile particles). We find that immobile particles, during the course of their displacements, exhibit stronger average pair correlations to their neighbors than mobile particles, but not necessarily higher average coordination numbers. We discuss how the correlation between structure and single-particle dynamics depends on observation time.

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