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Direct numerical analysis of dynamic facilitation in glass-forming liquids (2310.16935v2)
Published 25 Oct 2023 in cond-mat.soft, cond-mat.dis-nn, cond-mat.mtrl-sci, and cond-mat.stat-mech
Abstract: We propose a computational strategy to quantify the temperature evolution of the timescales and lengthscales over which dynamic facilitation affects the relaxation dynamics of glass-forming liquids at low temperatures, that requires no assumption about the nature of the dynamics. In two glass models, we find that dynamic facilitation depends strongly on temperature, leading to a subdiffusive spreading of relaxation events which we characterize using a temperature-dependent dynamic exponent. We also establish that this temperature evolution represents a major contribution to the increase of the structural relaxation time.