The inter-sublevel optical properties of a spherical quantum dot-quantum well with and without a donor impurity

TL;DR

This paper investigates the optical properties of a spherical quantum dot-quantum well heterostructure, analyzing how structural parameters and a central donor impurity influence inter-sublevel absorption and oscillator strengths.

Contribution

It provides a detailed numerical analysis of energy levels and optical properties considering the effects of a central donor impurity in multi-shell quantum dots.

Findings

Oscillator strengths depend strongly on core radii and layer thicknesses.

The presence of a donor impurity significantly affects optical absorption.

Energy eigenvalues are computed for various structural parameters.

Abstract

In this study, we have investigated the inter-sublevel optical properties of a core/shell/well/shell spherical quantum dot with the form of quantum dot-quantum well heterostructure. In order to determine the energy eigenvalues and corresponding wave functions, the Schr\"{o}dinger equation has been solved full numerically by using shooting method in the effective mass approximation for a finite confining potential. The inter-sublevel optical absorption and the oscillator strength between ground ($1s$) and excited ($1p$) states have been examined based on the computed energies and wave functions. Also, the effect of a hydrogenic donor impurity, located at the center of the multi-shell spherical quantum dot (MSQD), has been researched for different core radii ($R_1$), shell thicknesses ($T_s$) and well widths ($T_w$) in certain potential. It is observed that the oscillator strengths and the absorption coefficients are strongly depend on the core radii and layer thicknesses of the MSQD.