Abstract
Partial suppression of the spectral diffusion of quantum dot (QD) excitons tuned to resonance of a nano-photonic cavity is reported. The suppression is caused by the Purcell enhancement of the QD-exciton recombination rate, which alters the rate of charging of the solid-state environment by the QD itself. The effect can be used to spectrally-stabilize solid-state emitters of single photons and other non-classical states of light.
Highlights
It should be noticed that almost all quantum dot (QD) stopped diffusing spectrally if exposed to above-barrier excitation during several tens of minutes
We observed the modification of the spectral diffusion of QD excitons tuned to resonance with the modes of a photonic nano-cavity
The effect is explained by the Purcell enhancement of the QD-exciton lifetime, which, in turn, reduces the direct charging of the environment by charge released by the QD itself
Summary
Whereas most structures showed PL spectra stable over acquisition time, several samples exhibited spectral diffusion of the QD transitions (Fig. 1(c)). The charging rate of the QD environment and the spectral diffusion of the excitonic transitions are coupled to the X-CM detuning δ = E − ECM (Fig. 2(b,c)).
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