Emission dynamics of a magnetoexciton quantum-dot microcavity laser

We investigate the stimulated emission properties of an ${\mathrm{In}}_{0.18}$${\mathrm{Ga}}_{0.82}$As/GaAs quantum-well microcavity laser under strong magnetic confinement. The dynamics depend sensitively on excitation intensity and cavity mode energy, but show no magnetic-field dependence over a wide range of excitation conditions. The results evidence a fast relaxation which is uninhibited by the quasi-three-dimensional quantum confinement, and may indicate an advantage in designing quantum dots with equidistant energy levels, where Coulomb scattering via an Auger process is expected to be highly efficient.