Influence of carrier-carrier and carrier-phonon correlations on optical absorption and gain in quantum-dot systems

TL;DR

This paper presents a microscopic quantum kinetic theory analyzing how carrier-carrier and carrier-phonon interactions influence optical absorption and gain in semiconductor quantum dots, emphasizing the role of correlations and density effects.

Contribution

It introduces a detailed quantum kinetic model to study the impact of many-body correlations on optical properties of quantum dots, highlighting the significance of different dephasing mechanisms.

Findings

Carrier-carrier Coulomb interactions cause significant line-shifts.

Carrier-phonon interactions contribute notably to dephasing.

Dephasing mechanisms depend strongly on carrier density.

Abstract

A microscopic theory is used to study the optical properties of semiconductor quantum dots. The dephasing of a coherent excitation and line-shifts of the interband transitions due to carrier-carrier Coulomb interaction and carrier-phonon interaction are determined from a quantum kinetic treatment of correlation processes. We investigate the density dependence of both mechanisms and clarify the importance of various dephasing channels involving the localized and delocalized states of the system.