Photoluminiscence of a quantum dot hybridized with a continuum

TL;DR

This paper models photon emission from a quantum dot trion using the impurity Anderson model, successfully reproducing experimental features like non-monotonic energy dependence and non-Lorentzian line shapes.

Contribution

It introduces a theoretical calculation of photon emission intensity in quantum dots that aligns with experimental observations, using variational wave functions within the impurity Anderson framework.

Findings

Reproduces non-monotonic energy dependence on gate voltage

Explains non-Lorentzian line shapes in emission spectra

Shows line width increases near state instability regions

Abstract

We calculate the intensity of photon emission from a trion in a single quantum dot, as a function of energy and gate voltage, using the impurity Anderson model and variational wave functions. Assuming a flat density of conduction states and constant hybridization energy, the results agree with the main features observed in recent experiments: non-monotonic dependence of the energy on gate voltage, non-Lorentzian line shapes, and a line width that increases near the regions of instability of the single electron final state to occupations zero or two.