Exciton-polariton wakefields in semiconductor microcavities
  We consider the excitation of polariton wakefields due to a propagating source in a semiconductor micro cavity. We show that two kinds of wakes are possible, depending on the constituents fraction (either exciton or photon) of the polariton wavefunction. The nature of the wakefields (pure excitonic or polaritonic) can be controled by changing the speed of propagation of the external pump. This process could be used as a diagnostic for the internal parameters of the microcavity. 
H. Ter\c{c}as. J. T. Mendon\c{c}a
cond-mat.mes-hall quant-ph