title: Motion of spin polariton bullets in semiconductor microcavities.
abstract: The dynamics of optical switching in semiconductor microcavities in the strong coupling regime is studied by using time- and spatially resolved spectroscopy. The switching is triggered by polarized short pulses which create spin bullets of high polariton density. The spin packets travel with speeds of the order of 10(6)  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.
authors: Laboratoire Kastler Brossel, Université Pierre et Marie Curie, École Normale Supérieure et CNRS, UPMC Case 74, 4 place Jussieu, 75252 Paris Cedex 05, France.
authors: C
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authors: Adrados
authors: T C H
authors: TC
authors: Liew
authors: A
authors: A
authors: Amo
authors: M D
authors: MD
authors: Martín
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authors: Sanvitto
authors: C
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authors: Antón
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authors: Giacobino
authors: A
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authors: Kavokin
authors: A
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authors: Bramati
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authors: Viña