Effect of attractions on correlation length scales in a glass-forming liquid

Abstract

There is growing evidence that slow dynamics and dynamic heterogeneity possess structural signatures in glass-forming liquids. However, even in the weakly frustrated glass-forming liquids, whether or not the dynamic heterogeneity has a structural origin is a matter of debate. Via molecular dynamics simulation, we present a study of examining the connection between dynamic heterogeneity and bond orientational order in a weakly frustrated glass-forming liquid in two dimensions by taking advantage of assessing the effect of attractions on the correlation length scales. We find that attractions can strongly affect relaxation dynamics, dynamic heterogeneity and the associated dynamic correlation length of the liquid, but their influence on bond orientational order and the associated static correlation length shows a manner reminiscent of the effect of attractions on the thermodynamics of liquids. This implies that the growth of bond orientational order and static correlation length scale might be merely a manifestation of favoring the configurational entropy in weakly frustrated glass-forming liquids. Thus, our results lead strong evidence that bond orientational order cannot provide a complete description of dynamic heterogeneity even in weakly frustrated glass-forming systems.

8 pages, 9 figures, accepted for publication in Phys. Rev. E

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• Lifetimes and Lengthscales of Structural Motifs in a Model Glassformer
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• Hard ellipses: Equation of state, structure and self-diffusion
• Impact of size polydispersity on the nature of Lennard-Jones liquids
• Effect of Energy Polydispersity on the Nature of Lennard-Jones Liquids
• Linking dynamical heterogeneity to static amorphous order
• Even strong energy polydispersity does not affect the average structure and dynamics of simple liquids
• Granular packing as model glass formers