Self-Consistent Study of the Electronic Properties of a Single Exciton in Nanoscopic CdSe Quantum Dots
6 affiliations
- 1Facultad de Ciencias, Instituto Tecnológico Metropolitano (ITM)-Institución Universitaria, Campus Fraternidad, Calle 73 No. 76A-354 Vía al Volador, Medellín 050034, Colombia
- 2Grupo de Materia Condensada-UdeA, Instituto de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Cl 70 No. 52-21, Medellín 050010, Colombia
- 3Grupo de Investigación Ce-Lab, Departamento de Ciencias Básicas, Facultad de Ingeniería y Administración, Universidad Nacional de Colombia, Palmira 763533, Colombia
- 4Grupo de Investigación en Teoría de la Materia Condensada, Departamento de Física, Universidad del Magdalena, Santa Marta 470004, Colombia
- 5Quantum Materials and Nanophotonics Laboratory, A.B. Nalbandyan Institute of Chemical Physics NAS RA, P. Sevak 5/2, Yerevan 0014, Armenia
- 6Russian-Armenian University, 123 Hovsep Emin Str., Yerevan 0051, Armenia
Abstract
The electronic and excitonic properties of a single exciton confined in nanoscopic CdSe quantum dots with different geometries are investigated using a self-consistent Schrödinger-Poisson approach within the effective mass and Hartree approximations. Box, cylindrical, ellipsoidal, and square-based pyramidal quantum dots are considered, keeping their volume and cross-sectional area equal to isolate geometrical effects. The results show that increasing either the longitudinal (Lz) or transverse (L) dimension reduces the carrier confinement energies and produces a redshift of the exciton transition, with a stronger effect when the transverse dimensions are increased. The electron-hole Coulomb interaction decreases as the carrier wave functions become more spatially extended and remains strongly dependent on the quantum-dot geometry. Notably, the pyramidal structure exhibits the most pronounced geometry-dependent behavior, while the cylinder and ellipsoid show similar exciton transition energies because the energy associated with the strong confinement in the xy plane dominates over that associated with the weaker confinement along the z direction as the longitudinal parameter is increased. Similarly, the box and cylinder exhibit comparable exciton transition energies as the transverse parameter is increased. These results demonstrate that the shape and aspect ratio of nanoscopic quantum dots provide effective parameters for controlling their excitonic and optical properties.
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BibTeX
@article{gilcorrales2026selfconsistent,
title = {{Self-Consistent Study of the Electronic Properties of a Single Exciton in Nanoscopic CdSe Quantum Dots}},
author = {J. A. Gil-Corrales and C. A. Dagua-Conda and J. A. Vinasco and J. Sierra-Ortega and Gene Elizabeth Escorcia-Salas and A. L. Morales and D. B. Hayrapetyan and C. A. Duque},
journal = {Nanomaterials (Basel, Switzerland)},
year = {2026},
month = oct,
doi = {10.3390/nano16191266},
url = {https://europepmc.org/article/PMC/PMC13667246},
note = {CC BY},
}
RIS
TY - JOUR
TI - Self-Consistent Study of the Electronic Properties of a Single Exciton in Nanoscopic CdSe Quantum Dots
AU - J. A. Gil-Corrales
AU - C. A. Dagua-Conda
AU - J. A. Vinasco
AU - J. Sierra-Ortega
AU - Gene Elizabeth Escorcia-Salas
AU - A. L. Morales
AU - D. B. Hayrapetyan
AU - C. A. Duque
PY - 2026
DA - 2026/10/01
JO - Nanomaterials (Basel, Switzerland)
DO - 10.3390/nano16191266
UR - https://europepmc.org/article/PMC/PMC13667246
AB - The electronic and excitonic properties of a single exciton confined in nanoscopic CdSe quantum dots with different geometries are investigated using a self-consistent Schrödinger-Poisson approach within the effective mass and Hartree approximations. Box, cylindrical, ellipsoidal, and square-based pyramidal quantum dots are considered, keeping their volume and cross-sectional area equal to isolate geometrical effects. The results show that increasing either the longitudinal (Lz) or transverse (L) dimension reduces the carrier confinement energies and produces a redshift of the exciton transition, with a stronger effect when the transverse dimensions are increased. The electron-hole Coulomb interaction decreases as the carrier wave functions become more spatially extended and remains strongly dependent on the quantum-dot geometry. Notably, the pyramidal structure exhibits the most pronounced geometry-dependent behavior, while the cylinder and ellipsoid show similar exciton transition energies because the energy associated with the strong confinement in the xy plane dominates over that associated with the weaker confinement along the z direction as the longitudinal parameter is increased. Similarly, the box and cylinder exhibit comparable exciton transition energies as the transverse parameter is increased. These results demonstrate that the shape and aspect ratio of nanoscopic quantum dots provide effective parameters for controlling their excitonic and optical properties.
SN - 2079-4991
ER -