We study the system of two quantum dots lying on the central plane of a planar semiconductor microcavity. By solving the full Maxwell problem, we demonstrate that the rate of resonant excitation transfer between the two dots decays as $d^{ -1/2}$ as a function of the distance $d$ at long distance. This very long-range mechanism is due to the leaky and guided modes of the microcavity, which act as effective radiative transfer channels. At short distance, the $d^{ -3}$ dependence of the F\"orster mechanism, induced by the electrostatic dipole-dipole interaction, is recovered.
Categories: cond-mat.mes-hall cond-mat.other