From cage-jump motion to macroscopic diffusion in supercooled liquids

Abstract

The evaluation of the long term stability of a material requires the estimation of its long-time dynamics. For amorphous materials such as structural glasses, it has proven difficult to predict the long-time dynamics starting from static measurements. Here we consider how long one needs to monitor the dynamics of a structural glass to predict its long--time features. We present a detailed characterization of the statistical features of the single-particle intermittent motion of structural glasses, and show that single--particle jumps are the irreversible events leading to the relaxation of the system. This allows to evaluate the diffusion constant on the time--scale of the jump duration, which is small and temperature independent, well before the system enters the diffusive regime. The prediction is obtained by analyzing the particle trajectories via a parameter-free algorithm.

6 pages, 5 figures, accepted for publication in Soft Matter (21 May 2014)

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Cited by in corpus (19)

• Unveiling Dimensionality Dependence of Glassy Dynamics: 2D Infinite Fluctuation Eclipses Inherent Structural Relaxation
• Particle jumps in structural glasses
• Fast Dynamics in a Model Metallic Glass-forming Material
• Structural heterogeneity and its role in determining properties of disordered solids
• Dynamic phase coexistence in glass-forming liquids
• Cage Size and Jump Precursors in Glass-Forming Liquids: Experiment and Simulations
• Cage-jump motion reveals universal dynamics and non-universal structural features in glass forming liquids
• Connecting short and long time dynamics in hard-sphere-like colloidal glasses
• Spatial correlations of elementary relaxation events in glass-forming liquids
• Diffusion dynamics of supercooled water modeled with the cage-jump motion and hydrogen-bond rearrangement
• Active cage model of glassy dynamics
• Dynamical coexistence in moderately polydisperse hard-sphere glasses
• Unraveling the dynamic slowdown in supercooled water: The role of dynamic disorder in jump motions
• Superposition of droplet elasticity and volume fraction effects on emulsion dynamics
• Glassy dynamics of a binary Voronoi fluid: A mode-coupling analysis
• Record dynamics of evolving metastable systems: theory and applications
• Dynamics of dense hard sphere colloidal systems: a numerical analysis
• Jump Events in a 3D Edwards-Anderson Spin Glass
• Relaxation Dynamics of a Liquid in the Vicinity of an Attractive Surface: The Process of Escaping from the Surface