Polarization dependence of emission spectra of multiexcitons in self-assembled quantum dots

TL;DR

This study explores how the polarization affects the emission spectra of multiexcitons in quantum dots, revealing that emission intensities depend on state degeneracy but are largely unaffected by Coulomb interaction strength.

Contribution

It demonstrates that emission intensities are governed by state degeneracy and are independent of Coulomb interactions under certain symmetry conditions.

Findings

Emission intensities depend on degenerate states.

Transition energies are unaffected by Coulomb interactions.

Electron-hole symmetry leads to exact independence.

Abstract

We have investigated the polarization dependence of the emission spectra of p-shell multiexcitons of a quantum dot when the single particle level spacing is larger than the characteristic energy of the Coulomb interactions. We find that there are many degenerate multiexciton states. The emission intensities depend on the number of degenerate initial and final states of the optical transitions. However, unlike the transition energies, they are essentially independent of the strength of the Coulomb interactions. In the presence of electron-hole symmetry the independence is exact.