Publications (2)14.74 Total impact
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Article: Motion of spin polariton bullets in semiconductor microcavities.
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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.Physical Review Letters 09/2011; 107(14):146402. · 7.37 Impact Factor -
Article: Onset and dynamics of vortex-antivortex pairs in polariton optical parametric oscillator superfluids.
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ABSTRACT: We study, both theoretically and experimentally, the occurrence of topological defects in polariton superfluids in the optical parametric oscillator (OPO) regime. We explain in terms of local supercurrents the deterministic behavior of both the onset and dynamics of vortex-antivortex pairs generated by perturbing the system with a pulsed probe. Using a generalized Gross-Pitaevskii equation, including photonic disorder, pumping and decay, we elucidate the reason why topological defects form in couples and can be detected by direct visualizations in multishot OPO experiments.Physical Review Letters 07/2011; 107(3):036401. · 7.37 Impact Factor
