Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2011-05-31
Phys. Rev. E 85, 011102 (2012)
Physics
Condensed Matter
Statistical Mechanics
v2: Version accepted for publication in Phys. Rev. E
Scientific paper
10.1103/PhysRevE.85.011102
We analyze static point-to-set correlations in glass-forming liquids. The generic idea is to freeze the position of a set of particles in an equilibrium configuration and to perform sampling in the presence of this additional constraint. Qualitatively different geometries for the confining set of particles are considered and a detailed comparison of resulting static and dynamic correlation functions is performed. Our results reveal the existence of static spatial correlations not detected by conventional two-body correlators, which appear to be decoupled from, and shorter-ranged than, dynamical length scales characterizing dynamic heterogeneity. We find that the dynamics slows down dramatically under confinement, which suggests new ways to investigate the glass transition. Our results indicate that the geometry in which particles are randomly pinned is the best candidate to study static correlations.
Berthier Ludovic
Kob Walter
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