Solid-like mean-square displacement in glass-forming liquids

Thomas Schrøder*, Jeppe Dyre

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


It was recently shown that the real part of the frequency-dependent fluidity for several glass-forming liquids of different chemistry conforms to the prediction of the random barrier model (RBM) devised for ac electrical conduction in disordered solids [Bierwirth et al., Phys. Rev. Lett. 119, 248001 (2017)]. Inspired by these results, we introduce a crystallization-resistant modification of the Kob-Andersen binary Lennard-Jones mixture for which the results of extensive graphics-processing-unit-based molecular-dynamics simulations are presented. We find that the low-temperature mean-square displacement is fitted well by the RBM prediction, which involves no shape parameters. This finding highlights the challenge of explaining why a simple model based on hopping of non-interacting particles in a fixed random energy landscape with identical minima can reproduce the complex and highly cooperative dynamics of glass-forming liquids.

Original languageEnglish
Article number141101
JournalJournal of Chemical Physics
Issue number14
Number of pages6
Publication statusPublished - 9 Apr 2020

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