Coulomb-correlation effects on the non-linear optical properties of realistic quantum wires

TL;DR

This paper reviews how Coulomb interactions influence the linear and non-linear optical responses of realistic quantum wires, highlighting the removal of band-edge singularities and spectrum modifications due to electron-hole correlations.

Contribution

It introduces a comprehensive three-dimensional multisubband model for Coulomb effects in quantum wires, enabling direct comparison with experimental data.

Findings

Coulomb correlation removes band-edge singularities in absorption spectra.

Optical spectra are significantly modified by Coulomb effects across various carrier densities.

The model aligns well with experimental observations.

Abstract

We review recent results on the linear and non-linear optical response of realistic quantum-wire structures. Our theoretical approach is based on a set of generalized semiconductor Bloch equations, and allows a full three-dimensional multisubband description of Coulomb correlation for any shape of the confinement profile, thus permitting a direct comparison with experiments for available state-of-the-art wire structures. Our results show that electron-hole Coulomb correlation removes the one-dimensional band-edge singularities from the absorption spectra, whose shape results to be heavily modified with respect to the ideal free-particle case over the whole range of photoexcited carrier densities.