The Non-linear Optical Spin Hall Effect and Long-Range Spin Transport in   Polariton Lasers
  We report on the experimental observation of the non-linear analogue of the optical spin Hall effect under highly non-resonant circularly polarized excitation of an exciton polariton condensate in a GaAs/AlGaAs microcavity. Initially circularly polarized polariton condensates propagate over macroscopic distances while the collective condensate spins coherently precess around an effective magnetic field in the sample plane performing up to four complete revolutions. 
Elena Kammann, Timothy C.H. Liew, Hamid Ohadi, Pasquale Cilibrizzi,   Panayiotis Tsotsis, Zacharias Hatzopoulos, Pavlos G. S...
cond-mat.mes-hall cond-mat.other