Melting-freezing cycles in a relatively sheared pair of crystalline   monolayers
  The nonequilibrium dynamical behaviour that arises when two ordered two-dimensional monolayers of particles are sheared over each other is studied in Brownian dynamics simulations. A curious sequence of nonequilibrium states is observed as the driving rate is increased, the most striking of which is a sliding state with irregular alternation between disordered and ordered states. We comment on possible mechanisms underlying these cycles, and experiments that could observe them. 
Moumita Das, Sriram Ramaswamy and G. Ananthakrishna