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

Thomas Schrøder*, Jeppe Dyre

*Corresponding author

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer 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 LennardJones 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.
TidsskriftJournal of Chemical Physics
Udgave nummer14
Antal sider6
StatusUdgivet - 9 apr. 2020

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