Journal
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
Volume 339, Issue 3-4, Pages 469-481Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physa.2004.03.071
Keywords
Lennard-Jones glass; molecular dynamics; supercooled liquid; relaxation
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We perform a series of molecular dynamics simulations in a binary Lennard-Jones system at temperatures close to its mode-coupling temperature, T,. 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. (C) 2004 Elsevier B.V. All rights reserved.
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