Coulomb scattering in nitride based self-assembled quantum-dot systems

TL;DR

This paper investigates how Coulomb scattering affects carrier capture and relaxation in nitride-based quantum dots, highlighting the role of built-in electric fields and many-body effects on scattering efficiency.

Contribution

It introduces a comprehensive model that includes quantum-confined Stark effect and many-body renormalizations to analyze Coulomb scattering in nitride quantum dots.

Findings

Built-in electric fields significantly influence scattering rates.

Energy renormalization enhances scattering efficiency.

Charge separation impacts carrier relaxation processes.

Abstract

We study the carrier capture and relaxation due to Coulomb scattering in nitride-based quantum dots on the basis of population kinetics. For the states involved in the scattering processes the combined influence of the quantum-confined Stark effect and many-body renormalizations is taken into account. The charge separation induced by the built-in field has important consequences on the capture and relaxation rates. It is shown that its main effect comes through the renormalization of the energies of the states involved in the collisions, and leads to an increase in the scattering efficency.