Observation of long-lived polariton states in semiconductor microcavities across the parametric threshold
arXiv:0807.3224 · doi:10.1103/PhysRevLett.102.056402
Abstract
The excitation spectrum around the pump-only stationary state of a polariton optical parametric oscillator (OPO) in semiconductor microcavities is investigated by time-resolved photoluminescence. The response to a weak pulsed perturbation in the vicinity of the idler mode is directly related to the lifetime of the elementary excitations. A dramatic increase of the lifetime is observed for a pump intensity approaching and exceeding the OPO threshold. The observations can be explained in terms of a critical slowing down of the dynamics upon approaching the threshold and the following onset of the soft Goldstone mode.
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- Control and ultrafast dynamics of a two-fluid polariton switch
- Interactions and scattering of quantum vortices in a polariton fluid
- Phase-controlled bistability of a dark soliton train in a polariton fluid
- Transverse optical instability patterns in semiconductor microcavities: polariton scattering and low-intensity all-optical switching
- Tracking Dark Excitons with Exciton Polaritons in Semiconductor Microcavities
- Directional Goldstone waves in polariton condensates close to equilibrium
- Collective dynamics of excitons and polaritons in semiconductor nanostructures
- Polarization dependence of nonlinear wave mixing of spinor polaritons in semiconductor microcavities
- Ignition and formation dynamics of a polariton condensate on a semiconductor microcavity pillar
- Vortices in polariton OPO superfluids