Slow Dynamics of the High Density Gaussian Core Model

Abstract

We numerically study crystal nucleation and glassy slow dynamics of the one-component Gaussian core model (GCM) at high densities. The nucleation rate at a fixed supersaturation is found to decrease as the density increases. At very high densities, the nucleation is not observed at all in the time window accessed by long molecular dynamics (MD) simulation. Concomitantly, the system exhibits typical slow dynamics of the supercooled fluids near the glass transition point. We compare the simulation results of the supercooled GCM with the predictions of mode-coupling theory (MCT) and find that the agreement between them is better than any other model glassformers studied numerically in the past. Furthermore, we find that a violation of the Stokes-Einstein relation is weaker and the non-Gaussian parameter is smaller than canonical glassformers. Analysis of the probability distribution of the particle displacement clearly reveals that the hopping effect is strongly suppressed in the high density GCM. We conclude from these observations that the GCM is more amenable to the mean-field picture of the glass transition than other models. This is attributed to the long-ranged nature of the interaction potential of the GCM in the high density regime. Finally, the intermediate scattering function at small wavevectors is found to decay much faster than its self part, indicating that dynamics of the large-scale density fluctuations decouples with the shorter-ranged caging motion.

15 pages, 13 figures

References in corpus (17)

• Accurate determination of crystal structures based on averaged local bond order parameters
• Supercooled Liquids for Pedestrians
• Inhomogeneous Mode-Coupling Theory and Growing Dynamic Length in Supercooled Liquids
• The glass transition of dense fluids of hard and compressible spheres
• Compressing nearly hard sphere fluids increases glass fragility
• Anomalous structure and dynamics of the Gaussian-core fluid
• Increasing the density melts ultrasoft colloidal glasses
• Alpha-Relaxation Processes in Binary Hard-Sphere Mixtures
• Glass Transition of the Monodisperse Gaussian Core Model
• Cooperativity Beyond Caging: Generalized Mode Coupling Theory
• Glass transition of hard spheres in high dimensions
• Generalizing Rosenfeld's excess-entropy scaling to predict long-time diffusivity in dense fluids of Brownian particles: From hard to ultrasoft interactions
• Gaussian core model phase diagram and pair correlations in high Euclidean dimensions
• Composition and concentration anomalies for structure and dynamics of Gaussian-core mixtures
• Numerical Investigation of Glassy Dynamics in Low Density Systems
• Thermodynamics and Structural Properties of the High Density Gaussian Core Model
• Comment on "Mode-Coupling Theory as a Mean-Field Description of the Glass Transition"

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