Berlin 2005 – scientific programme

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HL: Halbleiterphysik

HL 62: Photonische Kristalle IV

HL 62.7: Talk

Wednesday, March 9, 2005, 12:15–12:30, TU P164

Spontaneous parametric scattering of microcavity polaritons in momentum space — •Wolfgang Langbein — Department of Physics and Astronomy, Cardiff

We measure the spontaneous parametric emission from a semiconductor microcavity after resonant pulsed coherent excitation. Resolving the emission in time and two-dimensional momentum space, the underlying scattering processes, which were theoretically treated by Ciuti et al., Phys. Rev. B 63, 041303 (2001), are validated. The predicted figure-8 shaped distribution of the final states of the parametric scattering is observed. We find a narrowing of the momentum distribution with time, which is a feature of memory effects in the scattering due to parametric correlation. Additionally, the influence of higher-order scattering and pump depletion are observed in the experiment.