Floquet engineering of excitons in semiconductor quantum dots

TL;DR

This paper demonstrates how high-frequency electromagnetic fields, analyzed through Floquet theory, can be used to control and stabilize excitons in semiconductor quantum dots, enabling ultrafast tuning of their optical properties.

Contribution

It introduces a Floquet-based theoretical framework for manipulating excitonic properties in quantum dots using high-frequency fields, a novel approach in this context.

Findings

High-frequency fields decrease exciton binding energy.

The fields dynamically stabilize excitons, increasing their radiative lifetime.

The theory enables ultrafast spectral tuning of quantum dot emitters.

Abstract

Within the Floquet theory of periodically driven quantum systems, we demonstrate that a high-frequency electromagnetic field can be used as an effective tool to control excitonic properties of semiconductor quantum dots (QDs). It is shown, particularly, that the field both decreases the exciton binding energy and dynamically stabilizes the exciton, increasing its radiative lifetime. The developed theory can serve as a basis for the ultrafast method to tune spectral characteristics of the QD-based photon emitters by a high-frequency field.