Quantum dot exciton dephasing by Coulomb interaction. A fermionic analogue of the independent boson model

TL;DR

This paper models the dephasing of quantum dot excitons due to Coulomb interactions with wetting layer carriers using a fermionic analogue of the independent boson model, employing a diagrammatic approach.

Contribution

It introduces a fermionic analogue of the independent boson model to analyze exciton dephasing, utilizing a scattering matrix and linked cluster expansion.

Findings

The model captures exciton dephasing dynamics accurately.

Diagrammatic expansion provides insights into Coulomb interaction effects.

Numerical example illustrates the model's applicability.

Abstract

The time evolution of a quantum dot exciton in Coulomb interaction with wetting layer carriers is treated using an approach similar to the independent boson model. The role of the polaronic unitary transform is played by the scattering matrix, for which a diagrammatic, linked cluster expansion is available. Similarities and differences to the independent boson model are discussed. A numerical example is presented.