Bunching visibility for correlated photons from single GaAs quantum dots

TL;DR

This paper investigates photon bunching in GaAs quantum dots, revealing that significant bunching occurs only at low excitation levels and is explained by a model based on Poissonian exciton statistics.

Contribution

It provides new experimental insights into photon bunching phenomena in GaAs quantum dots and introduces a model linking bunching peak height to exciton number probabilities.

Findings

Photon bunching is significant only at low excitation levels.

Bunching peak height inversely relates to the probability of multiple excitons.

Experimental results align with the Poissonian exciton statistics model.

Abstract

We study photon bunching phenomena associated with biexciton-exciton cascade in single GaAs self-assembled quantum dots. Experiments carried out with a pulsed excitation source show that significant bunching is only detectable at very low excitation, where the typical intensity of photon streams is less than the half of their saturation value. Our findings are qualitatively understood with a model which accounts for Poissonian statistics in the number of excitons, predicting the height of a bunching peak being determined by the inverse of probability of finding more than one exciton.