Renormalization Group Circuits for Gapless States
  We show that a large class of gapless states are renormalization group fixed points in the sense that they can be grown scale by scale using local unitaries. This class of examples includes some theories with dynamical exponent different from one, but does not include conformal field theories. The key property of the states we consider is that the ground state wavefunction is related to the statistical weight of a local statistical model. We give several examples of our construction in the context of Ising magnetism. 
Brian Swingle, John McGreevy, Shenglong Xu
cond-mat.str-el quant-ph