Optical properties of polaronic excitons in stacked quantum dots

TL;DR

This paper theoretically explores how polaronic excitons in stacked quantum dots influence optical properties, revealing that inter-dot coupling enhances phonon satellite absorption.

Contribution

It introduces a non-adiabatic theoretical model considering all relevant phonon modes for stacked quantum dots, highlighting the impact of dot coupling on optical absorption.

Findings

Strong enhancement of optical absorption due to dot coupling

Significant role of all phonon modes in exciton-phonon interaction

Potential for tuning optical properties via stacking arrangement

Abstract

We present a theoretical investigation of the optical properties of polaronic excitons in stacked self-assembled quantum dots, which is based on the non-adiabatic approach. A parallelepiped-shaped quantum dot is considered as a model for a self-assembled quantum dot in a stack. The exciton-phonon interaction is taken into account for all phonon modes specific for these quantum dots (bulk-like, half-space and interface phonons). We show that the coupling between stacked quantum dots can lead to a strong enhancement of the optical absorption in the spectral ranges characteristic for phonon satellites.