Dynamical heterogeneities in a two dimensional driven glassy model:   current fluctuations and finite size effects
  In this article, we demonstrate that in a transport model of particles with kinetic constraints, long-lived spatial structures are responsible for the blocking dynamics and the decrease of the current at strong driving field. Coexistence between mobile and blocked regions can be anticipated by a first-order transition in the large deviation function for the current. By a study of the system under confinement, we are able to study finite-size effects and extract a typical length between mobile regions. 
Francesco Turci and Estelle Pitard
cond-mat.dis-nn cond-mat.stat-mech