Tracking heterogeneous dynamics during the alpha-relaxation of a simple   glass-former
  We study the relaxation process in a simple glass-former - the KA lattice gas model. We show that, for this model, structural relaxation is due to slow percolation of regions of co-operatively moving particles, which leads to heterogeneous dynamics of the system. We find that the size distribution of these regions is given by a power-law and that their formation is encoded in the initial structure of the particles, with the memory of initial configuration increasingly retained with increasing density. 
Pinaki Chaudhuri, Srikanth Sastry, Walter Kob