SPATIAL HETEROGENEITY IN SUPERCOOLED LIQUIDS AND GLASSES

The dynamical properties of the supercooled liquids and glasses have b een studied via molecular dynamics (MD) simulation. We have found the spatial heterogeneity for long time region in our model fluids. The ma in factor of this heterogeneity originates from the linearly correlate d jump motion, which changes the configurations even in the glass stat e. This type of jump motion is assisted by the linearly correlated mot ion which takes place in much shorter time region than that of the res idence time of successive jump motions. Therefore it is concluded that the longtime heterogeneity in glasses originates from the linearly co rrelated motion in short time region.