Nonlinear relaxation of 0-dimension-trapped microcavity polaritons

Ounsi El Daif, Gael Nardin, Taofiq K. Paraiso, Augustin Baas, Maxime Richard, J. -P. Brantut, Francois Morier-Genoud, Benoit Deveaud-Pledran, Thierry Guillet

Published 2009-05-19Version 1

We study the emission properties of confined polariton states in shallow zero-dimensional traps under non-resonant excitation. We evidence several relaxation regimes. For slightly negative photon-exciton detuning, we observe a nonlinear increase of the emission intensity, characteristic of carrier-carrier scattering assisted relaxation under strong-coupling regime. This demonstrates the efficient relaxation towards a confined state of the system. For slightly positive detuning, we observe the transition from strong to weak coupling regime and then to single-mode lasing.