Plastic flow of persistent currents in two dimensional strongly   interacting systems
  The local persistent current in two dimensional strongly interacting systems is investigated. As the interaction strength is enhanced the current in the sample undergoes a transition from diffusive to ordered flow. The strong interacting flow has the characteristics of a plastic flow through dislocations in the pinned charge density wave which develops in the system at low densities. 
Richard Berkovits and Yshai Avishai