Distribution of local relaxation events in an aging three-dimensional glass: spatiotemporal correlation and dynamical heterogeneity.
By A. Smessaert, J. Rottler. 2013
42 citations recorded by the source corpus.
We investigate the spatiotemporal distribution of microscopic relaxation events, defined through particle hops, in a model polymer glass using molecular dynamics simulations. We introduce an efficient algorithm to directly identify hops during the simulation, which allows the creation of a map of relaxation events for the whole system. Based on this map, we present density-density correlations between hops and directly extract correlation scales. These scales define collaboratively rearranging groups of particles and their size distributions are presented as a function of temperature and age. Dynamical heterogeneity is spatially resolved as the aggregation of hops into clusters, and we analyze their volume distribution and growth during aging. A direct comparison with the four-point dynamical susceptibility χ(4) reveals the formation of a single dominating cluster prior to the χ(4) peak, which indicates maximally correlated dynamics. An analysis of the fractal dimension of the hop clusters finds slightly noncompact shapes in excellent agreement with independent estimates from four-point correlations.
Subfields: Food Science, Materials Chemistry, Physical and Theoretical Chemistry
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Materials Chemistry
Citations in the corpus
- Deformation and flow of amorphous solids: Insights from elastoplastic models (2017, background): “…silicon glasses (amorphous silicon) (Albaret et al., 2016; Fusco et al., 2014), - numerical models of polymer glasses (Papakonstantopoulos et al., 2008; Smessaert and Rottler, 2013) - dense colloidal suspensions (Chikkadi and Schall, 2012; Jensen et al., 2014; Schall et al., 2007), - concentrated…”