Notes on the bunching peak of g(2) functions for correlated photons from single quantum dots

TL;DR

This paper theoretically analyzes the second-order correlation functions of photons emitted from single quantum dots, revealing that photon bunching is prominent only at very low excitation levels due to exciton number effects.

Contribution

It introduces a theoretical model that accounts for detection efficiency and exciton number distribution to explain photon bunching behavior in quantum dot emissions.

Findings

Bunching peak height depends on mean exciton number N.

Significant bunching occurs only at very low excitation levels (N<<2).

Detection efficiency influences observed photon correlations.

Abstract

Second-order correlation functions for photon pulses associated with exciton-biexciton cascades are theoretically derived. A finite efficiency in photon detection and statistical distribution in exciton numbers are taken into account. It is found that the bunching peak height of photon statistics (g(2)(0)) depends on the mean number of excitons, N, and significant bunching is only detectable at very low excitation, N<<2.