Ballistic displacements within string-like motions in a supercooled liquid

G.A. Appignanesi, M.A. Frechero, L.M. Alarcón, J.A. Rodriguez Fris and R.A. Montani

Physica A: Statistical Mechanics and its Applications, 2004, vol. 339, issue 3, 469-481

Abstract: We perform a series of molecular dynamics simulations in a binary Lennard-Jones system at temperatures close to its mode-coupling temperature, Tc. We demonstrate that the string-like movements carried out by a fraction of the particles are of ballistic nature. Depending on temperature these ballistic strings are found to become rare events related to free-volume effects on the sample. These facts point to a mechanistic description of the transport process and enables us to provide a microscopic reason for the occurrence of timescale separation.

Keywords: Lennard-Jones glass; Molecular dynamics; Supercooled liquid; Relaxation (search for similar items in EconPapers)
Date: 2004
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:339:y:2004:i:3:p:469-481

DOI: 10.1016/j.physa.2004.03.071

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