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

Thomas Schrøder*, Jeppe Dyre

*Corresponding author

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Abstract

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.
OriginalsprogEngelsk
Artikelnummer141101
TidsskriftJournal of Chemical Physics
Vol/bind152
Antal sider6
ISSN0021-9606
DOI
StatusUdgivet - 9 apr. 2020

Bibliografisk note

This article has been found as a ’Free Version’ from the Publisher on June 4, 2020. When access to the article closes, please notify rucforsk@ruc.dk

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