Publications

A crossover in spatio-temporal correlations of strain fluctuations in glass forming liquids

Hassani, M. and Bruns, M. and Varnik, F.

JOURNAL OF STATISTICAL MECHANICS: THEORY AND EXPERIMENT
Volume: 2020 Pages:
DOI: 10.1088/1742-5468/ab5366
Published: 2020

Abstract
Via molecular dynamics simulations of a generic glass former in the supercooled and normal liquid states, it is shown that spatial correlations of strain fluctuations exhibit a crossover from the well-established power-law ∼1/r 3-decay at long wavelengths to an exponential behavior, ∼&esp(-r/lc) at intermediate distances. The characteristic length of the exponential decay grows both with temperature and time via, l2 c ∝ D(T)t, with D(T) being the temperature-dependent diffusion coefficient. This suggests that the crossover between the power-law and exponential decays is governed by a diffusion process. © 2020 IOP Publishing Ltd and SISSA Medialab srl.

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