Kinetic Heterogeneities at Dynamical Crossovers

Details Kinetic Heterogeneities at Dynamical Crossovers Kinetic Heterogeneities at Dynamical Crossovers

2010-02-02

arxiv.org/abs/1002.0520v2

EPL 90, 66004 (2010)

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 4 figures

Scientific paper

We perform molecular dynamics simulations of a model glass-forming liquid to measure the size of kinetic heterogeneities, using a dynamic susceptibility $\chi_{\rm ss}(a, t)$ that quantifies the number of particles whose dynamics are correlated on the length scale $a$ and time scale $t$. By measuring $\chi_{\rm ss}(a, t)$ as a function of both $a$ and $t$, we locate local maxima $\chi^\star$ at distances $a^\star$ and times $t^\star$. Near the dynamical glass transition, we find two types of maxima, both correlated with crossovers in the dynamical behavior: a smaller maximum corresponding to the crossover from ballistic to sub-diffusive motion, and a larger maximum corresponding to the crossover from sub-diffusive to diffusive motion. Our results indicate that kinetic heterogeneities are not necessarily signatures of an impending glass or jamming transition.

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