Ultralong-range radiative excitation transfer between quantum dots in a planar microcavity

TL;DR

This paper demonstrates that quantum dots in a planar microcavity can transfer excitation over very long distances, with transfer rates decaying as d^{-1/2}, due to microcavity modes, surpassing traditional F"orster transfer.

Contribution

It reveals a long-range radiative excitation transfer mechanism between quantum dots mediated by microcavity modes, extending beyond the traditional F"orster interaction.

Findings

Transfer rate decays as d^{-1/2} at long distances.

Short-distance transfer follows d^{-3} F"orster behavior.

Microcavity modes enable ultralong-range excitation transfer.

Abstract

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.