Intermediate band formation and intraband absorption for electrons in an inhomogeneous chain of quantum dots

TL;DR

This paper investigates how inhomogeneity in a chain of quantum dots affects electron states and intraband absorption, revealing the disintegration of pseudo-bands and the influence of QD size on absorption spectra.

Contribution

It provides a detailed analysis of electron state behavior and intraband absorption in inhomogeneous quantum dot chains, highlighting the effects of energy inhomogeneity and size.

Findings

Pseudo-band disintegration with increased inhomogeneity

Localization impacts intraband absorption spectra

QD size influences absorption characteristics

Abstract

We study the electron states of a chain of non-identical, vertically stacked quantum dots (QDs). We discuss how the pseudo-band formed of the ground states confined in the QDs disintegrates upon increasing the inhomogeneity of the electron energies and analyze the impact of localization on the intraband absorption from the pseudo-band to extended (bulk) states. We describe also the dependence of the intraband absorption spectrum on the QD size.