Spatial Correlations of Mobility and Immobility in a Glassforming Lennard-Jones Liquid

Details Spatial Correlations of Mobility and Immobility in a Glassforming Lennard-Jones Liquid Spatial Correlations of Mobility and Immobility in a Glassforming Lennard-Jones Liquid

1998-10-06

arxiv.org/abs/cond-mat/9810060v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevE.60.3107

Using extensive molecular dynamics simulations of an equilibrium, glass-forming Lennard-Jones mixture, we characterize in detail the local atomic motions. We show that spatial correlations exist among particles undergoing extremely large (``mobile'') or extremely small (``immobile'') displacements over a suitably chosen time interval. The immobile particles form the cores of relatively compact clusters, while the mobile particles move cooperatively and form quasi-one-dimensional, string-like clusters. The strength and length scale of the correlations between mobile particles are found to grow strongly with decreasing temperature, and the mean cluster size appears to diverge at the mode-coupling critical temperature. We show that these correlations in the particle displacements are related to equilibrium fluctuations in the local potential energy and local composition.

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