Dynamic facilitation explains democratic particle motion of metabasin transitions

Details Dynamic facilitation explains democratic particle motion of metabasin transitions Dynamic facilitation explains democratic particle motion of metabasin transitions

2007-06-07

arxiv.org/abs/0706.0902v2

J. Phys. A: Math. Theor. 41 (2008) 324006.

Physics

Condensed Matter

Statistical Mechanics

6 pages, 6 figures

Scientific paper

10.1088/1751-8113/41/32/324006

Transitions between metabasins in supercooled liquids seem to occur through rapid "democratic" collective particle rearrangements. Here we show that this apparent homogeneous particle motion is a direct consequence of dynamic facilitation. We do so by studying metabasin transitions in facilitated spin models and constrained lattice gases. We find that metabasin transitions occur through a sequence of locally facilitated events taking place over a relatively short time frame. When observed on small enough spatial windows these events appear sudden and homogeneous. Our results indicate that metabasin transitions are essentially "non-democratic" in origin and yet another manifestation of dynamical heterogeneity in glass formers.

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