Related Experiment Video
Updated: Dec 29, 2025
10:40
High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
7.9K
Donor impurity energy and optical absorption in spherical sector quantum dots
M E Mora-Ramos1,2, A El Aouami3, E Feddi3
1Centro de Investigación en Ciencias, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, CP 62209, Cuernavaca, Morelos, Mexico.
Heliyon
|January 29, 2020
Summary
This study investigates electron states in spherical sector quantum dots, finding geometry and donor position significantly alter energy levels. Results align with experiments and suggest photoluminescence peaks are donor-related.
Area of Science:
- Condensed Matter Physics
- Quantum Mechanics
- Materials Science
Background:
- Donor impurity centers significantly influence quantum dot properties.
- Spherical sector quantum dots offer tunable electronic and optical characteristics.
Purpose of the Study:
- To theoretically investigate electron states in donor-doped spherical sector GaAs-Al0.3Ga0.7As quantum dots.
- To analyze the impact of geometry and impurity position on energy levels and optical absorption.
- To validate the model against experimental data and resolve discrepancies in photoluminescence peak assignments.
Main Methods:
- Effective mass approximation and numerical solution of the 3D Schrödinger equation.
- Finite element method for solving the envelope function.
- Calculation of linear optical absorption coefficient.
Main Results:
- Conical structure geometry (radius, apical angle) and donor position modify the energy spectrum.
- Optical absorption spectra reveal transitions between confined energy levels.
- Excellent agreement with experimental data for GaAs quantum dots.
- Identified the lowest photoluminescence peak as donor-related, contradicting previous assignments.
Conclusions:
- The theoretical model accurately predicts electron states and optical properties in spherical sector quantum dots.
- The study provides crucial insights into the role of donor impurities in quantum dot behavior.
- The findings offer a revised interpretation of experimental photoluminescence data.
