We report a new mechanism of non-linear coupling of optically active and dark crystal states. We observe experimentally pronounced beats of the intensity of photoluminescence from a bottleneck region of the exciton-polariton band in a microcavity in the strong coupling regime and at strong pumping. These beats are extremely sensitive to the pumping intensity and vanish for weak pumping. We show theoretically that coherent polariton-polariton scattering which leads to the mixing between bright and dark exciton states can be responsible for this effect.
|Number of pages||6|
|Journal||Solid State Communications|
|Publication status||Published - Jul 2005|
Bibliographical noteFunding Information:
This work has been partially supported by the Spanish MCYT (MAT2002-00139), the CAM (GR/MAT/0099/2004) and the ‘Marie–Curie’ MRTN-CT-2003-503677 ‘Clermont2’ (‘Physics of Microcavities’). A.K. and G.M. acknowledge the support of the European Research Office of the US Army, contract number N62558-03-M0803.
- A. Microcavities
- D. Bottleneck
- D. Coherence
- D. Dark excitons
- D. Polaritons
- D. Quantum beats
- E. Time-resolved spectroscopy