Heterogeneity and growing length scales in the dynamics of kinetically constrained lattice gases in two dimensions.

We study dynamical heterogeneity and growing dynamical length scales in two kinetically constrained models, namely, the one- and two-vacancy assisted triangular lattice gases. One of the models is a strong glassformer and the other is a fragile glassformer. Both exhibit heterogeneous dynamics with broadly distributed time scales as seen in the distribution of persistence times. We show that the Stokes-Einstein relation is violated, to a greater degree in the fragile glassformer, and show how this violation is related to dynamic heterogeneity. We extract dynamical length scales from structure factors of mobile particles and show, quantitatively, the growth of this length scale as density increases. We comment on how the scaling of lengths and times in these models relates to that in facilitated spin models of glasses.

• Publication year

  2004

• Venue

  Physical review. E, Statistical, nonlinear, and soft matter physics

• Publication date

  2004-10-21

• Fields of study

  Medicine, Physics

• Identifiers
  DOI 10.1103/PhysRevE.72.041106arXiv cond-mat/0410525PMID 16383361
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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