Abstract
We report on non-conventional lasing in a photonic-crystal nanocavity that operates with only four solid-state quantum-dot emitters. In a comparison between microscopic theory and experiment, we demonstrate that irrespective of emitter detuning, lasing with {g}^{mathrm{(2)}}=1 is facilitated by means of emission from dense-lying multi-exciton states. In the spontaneous-emission regime we find signatures for radiative coupling between the quantum dots. The realization of different multi-exciton states at different excitation powers and the presence of electronic inter-emitter correlations are reflected in a pump-rate dependence of the β-factor.
Highlights
Self-assembled semiconductor quantum dots (QDs) exhibit a discrete density of electronic states due to quantization effects owed to their nanometer-sized dimension[1]
Another effect has been explored in atomic[10] and solid-state lasers with ensembles of QDs11, in which few discrete emitters can exchange photons via a high-Q cavity mode, thereby establishing electronic inter-emitter correlations that are connected to superradiance
The microscopic approach accounts for the semiconductor properties of the solid-state emitters by allowing multi-excitonic states of each emitter to couple to the cavity mode, and to form electronic correlations between different emitters
Summary
Self-assembled semiconductor quantum dots (QDs) exhibit a discrete density of electronic states due to quantization effects owed to their nanometer-sized dimension[1]. We study a PhC nanocavity laser with an energy-tunable mode, pumped predominantly via the discrete multi-exciton states of only four QD emitters by combining confocal and photon correlation spectroscopy with a quantum-optical theory.
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