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.
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.
| Originalsprog | Engelsk |
|---|---|
| Artikelnummer | 141101 |
| Tidsskrift | Journal of Chemical Physics |
| Vol/bind | 152 |
| Udgave nummer | 14 |
| Antal sider | 6 |
| ISSN | 0021-9606 |
| DOI | |
| Status | Udgivet - 9 apr. 2020 |