Static and dynamic lengthscales in a simple glassy plaquette model

Details Static and dynamic lengthscales in a simple glassy plaquette model Static and dynamic lengthscales in a simple glassy plaquette model

2005-02-04

arxiv.org/abs/cond-mat/0502120v2

Phys. Rev. E 72, 016103 (2005)

Physics

Condensed Matter

Statistical Mechanics

12 pages, 13 figs; published version

Scientific paper

10.1103/PhysRevE.72.016103

We study static and dynamic spatial correlations in a two-dimensional spin model with four-body plaquette interactions and standard Glauber dynamics by means of analytic arguments and Monte Carlo simulations. We study in detail the dynamical behaviour which becomes glassy at low temperatures due to the emergence of effective kinetic constraints in a dual representation where spins are mapped to plaquette variables. We study the interplay between non-trivial static correlations of the spins and the dynamic `four-point' correlations usually studied in the context of supercooled liquids. We show that slow dynamics is spatially heterogeneous due to the presence of diverging lengthscales and scaling, as is also found in kinetically constrained models. This analogy is illustrated by a comparative study of a froth model where the kinetic constraints are imposed.

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