Coulomb correlated multi-particle states of weakly confining GaAs quantum dots

TL;DR

This paper models Coulomb-correlated multi-particle states in weakly confining GaAs quantum dots, accurately predicting emission properties and lifetimes, and explores electric-field effects and exchange sensitivities using advanced computational methods.

Contribution

It introduces a comprehensive computational framework combining an 8-band k·p model with continuum elasticity and configuration interaction to accurately predict multi-particle states and emission properties in quantum dots.

Findings

BDA yields lifetimes in agreement with experiments.

Framework reproduces electric-field tuning of electronic structure.

Assesses sensitivity to exchange interactions and CI basis size.

Abstract

We compute the electronic and emission properties of Coulomb-correlated multi-particle states (X$^0$, X$^\pm$, XX) in weakly confining GaAs/AlGaAs quantum dots using an 8-band $\mathbf{k}\!\cdot\!\mathbf{p}$ model coupled to continuum elasticity and configuration interaction (CI). We evaluate polarization-resolved oscillator strengths and radiative rates both in the dipole approximation (DA) and in a quasi-electrostatic beyond-dipole (BDA) longitudinal formulation implemented via a Poisson reformulation exactly equivalent to the dyadic Green-tensor kernel. For the dots studied, BDA yields lifetimes in quantitative agreement with experiment, e.g., $\tau^X=0.279\,\mathrm{ns}$ vs $0.267\,\mathrm{ns}$ (exp.) and $\tau^{XX}=0.101\,\mathrm{ns}$ vs $0.115\,\mathrm{ns}$ (exp.). The framework also reproduces electric-field tuning of the multi-particle electronic structure and emission-including the indistinguishability inferred from $P=\tau^X/(\tau^X+\tau^{XX})$-and we assess sensitivity to CI-basis size and to electron-electron and hole-hole exchange.