Programming scale-free optics in disordered ferroelectrics
  Using the history-dependence of a dipolar glass hosted in a compositionally-disordered lithium-enriched potassium-tantalate-niobate (KTN:Li) crystal, we demonstrate scale-free optical propagation at tunable temperatures. The operating equilibration temperature is determined by previous crystal spiralling in the temperature/cooling-rate phase-space. 
Jacopo Parravicini, Claudio Conti, Aharon J. Agranat and Eugenio DelRe
physics.optics cond-mat.dis-nn cond-mat.other nlin.PS