Coulomb correlations evidenced in the magneto-optical spectra of charged excitons in semiconductor quantum dots

TL;DR

This study investigates how Coulomb interactions influence the magneto-optical spectra of charged excitons in semiconductor quantum dots, revealing the impact of quantum dot shape and carrier correlations on g factors.

Contribution

It provides new insights into Coulomb correlations' effects on excitonic states and the sensitivity of hole g factors to quantum dot asymmetry.

Findings

Hole g factor is highly sensitive to QD shape asymmetry.

Coulomb correlations significantly affect the spectral patterns of charged excitons.

Effective g factors differ between neutral and charged excitons in the same QD.

Abstract

The emission spectral pattern of a charged exciton in a semiconductor quantum dot is composed of a quadruplet of linearly polarized lines in the presence of a magnetic field oriented perpendicularly to the direction of the photon momentum. By measuring the Zeeman splittings, we obtain the effective g factors of the carriers and find that the hole g factor is very sensitive to the QD shape asymmetry. By comparing the effective g factors obtained for the neutral and the charged excitons in the same quantum dot, we uncover the role of Coulomb correlations in these excitonic states.