Self-rotation and synchronization in exciton-polariton condensates
  Self-rotation occurs in an exciton-polariton condensate in a two-dimensional semiconductor microcavity pumped by a nonresonant Gaussian laser beam. A wave packet of the condensate spontaneously rotates around the center of the pumped region at a constant frequency breaking the rotation symmetry of the system. When two self-rotating condensates are created with an appropriate distance, synchronization occurs between the dynamics of the self-rotating condensates. 
Hiroki Saito and Rina Kanamoto
cond-mat.mes-hall cond-mat.quant-gas