New Universality Class at the Superconductor--Insulator Transition
  We study dynamic properties of thin films near the superconductor - insulator transition. We formulate the problem in a phase representation. The key new feature of our model is the assumption of a {\it local} ohmic dissipative mechanism. Coarse graining leads to a Ginzburg-Landau description, with non-ohmic dynamics for the order parameter. For strong enough damping a new universality class is observed. It is characterized by a {\it non-universal} d.c. conductivity, and a damping dependent dynamical critical exponent. The formulation also provides a description of the magnetic field-tuned transition. Several microscopic mechanisms are proposed as the origin of the dissipation. 
Karl-Heinz Wagenblast (Karlsruhe), Anne van Otterlo (ETH Zuerich),   Gerd Sch\"on (Karlsruhe), and Gergely T. Zim\'anyi (UC ...