Role of structure in the alpha and beta dynamics of a simple glass-forming liquid

Abstract

The elusive connection between dynamics and local structure in supercooled liquids is an important piece of the puzzle in the unsolved problem of the glass transition. The Johari-Goldstein beta relaxation, ubiquitous in glass-forming liquids, exhibits mean properties that are strongly correlated to the long-time alpha dynamics. However, the former comprises simpler, more localized motion, and thus has perhaps a more straightforward connection to structure. Molecular dynamics simulations were carried out on a two-dimensional, rigid diatomic molecule (the simplest structure exhibiting a distinct beta process) to assess the role of the local liquid structure on both the Johari-Goldstein beta and the alpha relaxation. Although the average properties for these two relaxations are correlated, there is no connection between the beta and alpha properties of a given (single) molecule. The propensity for motion at long times is independent of the rate or strength of a molecule's beta relaxation. The mobility of a molecule averaged over many initial energies, a measure of the influence of structure, was found to be heterogeneous, with clustering at both the beta and alpha timescales. This heterogeneity is less extended spatially for the beta than for the alpha dynamics, as expected; however, the local structure is the more dominant control parameter for the beta prcoess. In the glassy state, the arrangement of neighboring molecules determines entirely the relaxation properties, with no discernible effect from the particle momenta.

arXiv comment9 pages, 8 figures

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Cited by in corpus (6)

• Signature of Dynamical Heterogeneity in Spatial Correlations of Particle Displacement and its Temporal Evolution in Supercooled Liquids
• Johari-Goldstein heterogeneous dynamics in a model polymer
• A test for the existence of isomorphs in glass-forming materials
• Participation in the Johari-Goldstein Process - Molecular Liquids versus Polymers
• Rotational and translational dynamics in dense fluids of patchy particles
• Dynamic heterogeneity in an orientational glass