Small excitonic complexes in a disk-shaped quantum dot

TL;DR

This paper investigates the properties of confined excitonic complexes in two-dimensional disk-shaped quantum dots, analyzing their binding behavior across various configurations and system sizes using Bethe-Goldstone equations.

Contribution

It introduces a detailed analysis of excitonic complexes with up to twelve pairs in quantum dots, including asymmetric configurations, using a many-body theoretical approach.

Findings

Weak confinement leads to weak binding or unbinding in triexciton and four-exciton systems.

Higher complexes tend to be bound under weak confinement.

Asymmetric configurations exhibit varied binding behaviors.

Abstract

Confined excitonic complexes in two dimensions, consisting of N_e electrons and N_h holes, are studied by means of Bethe-Goldstone equations. Systems with up to twelve pairs, and asymmetric configurations with N_e \ne N_h are considered. The weak confinement regime gives indication of weak binding or even unbinding in the triexciton and the four-exciton system, and binding in the higher complexes.