Continuous Preparation of a Fractional Chern Insulator
  We present evidence of a direct, continuous quantum phase transition between a Bose superfluid and the $\nu=1/2$ fractional Chern insulator in a microscopic lattice model. In the process, we develop a detailed field theoretic description of this transition in terms of the low energy vortex dynamics. The theory explicitly accounts for the structure of lattice symmetries and predicts a Landau forbidden transition that is protected by inversion. That the transition is continuous enables the quasi-adiabatic preparation of the fractional Chern insulator in non-equilibrium, quantum optical systems. 
M. Barkeshli and N.Y. Yao and C.R. Laumann
cond-mat.str-el cond-mat.quant-gas quant-ph