Polaron contributions to the biexciton binding energies in self-assembled quantum dots

TL;DR

This paper estimates how polaron interactions with optical phonons influence biexciton binding energies in quantum dots, showing they can significantly reduce the binding energy by up to 30%.

Contribution

It introduces a perturbation theory approach to quantify polaron effects on biexciton energies in a simple quantum dot model.

Findings

Polaron effects can reduce biexciton binding energy by up to 30%.

Polaron contributions tend to counteract Coulomb-related biexciton shifts.

The impact varies depending on material parameters.

Abstract

The contribution to the biexciton binding energy in quantum dots resulting from the interaction with longitudinal optical phonons is estimated by performing the configuration--interaction calculation of the few-particle states in a simple model of the confining potential and including the phonon corrections by means of a perturbation theory. It is found that the polaron contribution tends to compensate the Coulomb-related biexciton shift (binding energy) and reduces its value by several to even 30%, depending on the material parameters of the system.