Spatial Heterogeneity in Supercooled Liquids and Glasses

The dynamical properties of the supercooled liquids and glasses have been studied via molecular dynamics (MD) simulation. We have found the spatial heterogeneity for long time region in our model fluids. The main factor of this heterogeneity originates from the linearly correlated jump motion, which changes the configurations even in the glass state. This type of jump motion is assisted by the linearly correlated motion which takes place in much shorter time region than that of the residence time of successive jump motions. Therefore it is concluded that the longtime heterogeneity in glasses originates from the linearly correlated motion in short time region.