Quantum dots acting as single photon emitters in the blue-green range are fabricated and characterized at cryogenic temperature. They consist in CdSe dots inserted in (Zn,Mg)Se nanowires with a thick shell. Photoluminescence spectra, decay curves and autocorrelation functions were measured under nonresonant continuous-wave and pulsed excitation. An analytical approach is applied simultaneously to the decay curves and correlation functions. It allows a quantitative description of how these two quantities are affected by the exciton rise due to biexciton feeding, the bright exciton decay, the effect of the dark exciton, and the re-excitation between two laser pulses. Linewidths at our limit of resolution (200 μeV) are recorded. The reported correlation counts vary from a full control by re-excitation from traps, to a small contribution of re-excitation by mobile carriers or other QDs, as low as 5%.
@article{arxiv.2205.03089,
title = {Quantitative analysis of the blue-green single-photon emission from a quantum dot in a thick tapered nanowire},
author = {Saransh Raj Gosain and Edith Bellet-Amalric and Eric Robin and Martien den Hertog and Gilles Nogues and Joël Cibert and Kuntheak Kheng and David Ferrand},
journal= {arXiv preprint arXiv:2205.03089},
year = {2023}
}