Topological Superfluid Transition Induced by Periodically Driven Optical   Lattice
  We propose a scenario to create topological superfluid in a periodically driven two-dimensional square optical lattice. We study the phase diagram of a spin-orbit coupled s-wave pairing superfluid in a periodically driven two-dimensional square optical lattice. We find that a phase transition from a trivial superfluid to a topological superfluid occurs when the potentials of the optical lattices are periodically changed. The topological phase is called Floquet topological superfluid and can host Majorana fermions. 
Guocai Liu, Ningning Hao, Shi-Liang Zhu and W. M. Liu
cond-mat.mes-hall cond-mat.other