spin polariton bullets http://arxiv.org/pdf/1309.6344v1.pdf
*Motion of spin polariton bullets in semiconductor microcavities* Spin bullets of high polariton density exist. The spin packets travel with speeds of the order of 1,000,000 m/s due to the ballistic propagation and drift of exciton-polaritons from high to low density areas. The speed is controlled by the angle of incidence of the excitation beams, which changes the polariton group velocity. This leads to the realization that polaritons can decouple from their ion holes and exist in a hybrid state of just electrons and light waves. Upon coulomb decay, when the electrons leave the bullet structure, does that bullet structure persist as just light wave solitons?
