Following microscopic motion in a two dimensional glass-forming binary fluid

Details Following microscopic motion in a two dimensional glass-forming binary fluid Following microscopic motion in a two dimensional glass-forming binary fluid

2007-11-07

arxiv.org/abs/0711.1039v1

Physics

Condensed Matter

Soft Condensed Matter

12 pages, 7 figures

Scientific paper

10.1088/0953-8984/20/24/244127

The dynamics of a binary mixture of large and small discs are studied at temperatures approaching the glass transition using an analysis based on the topology of the Voronoi polygon surrounding each atom. At higher temperatures we find that dynamics is dominated by fluid-like motion that involves particles entering and exiting the nearest-neighbour shells of nearby particles. As the temperature is lowered, the rate of topological moves decreases and motion becomes localised to regions of mixed pentagons and heptagons. In addition we find that in the low temperature state particles may translate significant distances without undergoing changes in their nearest neig hbour shell. These results have implications for dynamical heterogeneities in glass forming liquids.

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