Correlation effects in strain-induced quantum dots

We report on Coulomb correlation effects in the luminescence of strain-indu ced quantum dots. In single dots, under low power excitation, we observe th e rising of sharp lines associated to the formation of excitonic molecules. In the grand-ensemble, in magnetic fields up to 45 T, we observe Darwin-Fo ck stales of the dots to merge into a unique Landau level, with a considera ble reduction in the total diamagnetic shift due to the enhanced electron-h ole correlation caused by the increased degeneracy of the slate.