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Condensed Matter
Volume 8
Issue 3
10.3390/condmat8030066
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Article

Effect of External Fields on the Electronic and Optical Properties in ZnTe/CdSe and CdSe/ZnTe Spherical Quantum Dots

by
Rafael G. Toscano-Negrette
1,2,*,
José C. León-González
1,2,
Juan A. Vinasco
1,
Alvaro L. Morales
1,*,
Miguel E. Mora-Ramos
3 and
Carlos A. Duque
1
1
Grupo de Materia Condensada-UdeA, Instituto de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín 050010, Colombia
2
Departamento de Física y Electrónica, Universidad de Córdoba, Carrera 6 No. 77-305, Montería 230002, Colombia
3
Centro de Investigación en Ciencias, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca CP 62209, Morelos, Mexico
*
Authors to whom correspondence should be addressed.
Condens. Matter 2023, 8(3), 66; https://doi.org/10.3390/condmat8030066
Submission received: 22 June 2023 / Revised: 25 July 2023 / Accepted: 28 July 2023 / Published: 2 August 2023
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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Abstract

A theoretical analysis was conducted to examine the electronic and optical properties of a confined electron and a hole in a type-II core-shell spherical quantum dot composed of CdSe/ZnTe and ZnTe/CdSe. The Schrödinger equation for the electron and the hole was numerically solved using COMSOL-Multiphysics software in the 2D axisymmetric module, which employs the finite element method under the effective mass approximation. A Fortran code was utilized to calculate excitonic energy, specifically designed to solve the Coulomb integral. The calculations encompassed variations in the inner radius (R1), as well as variations in the electric (Fz) and magnetic (B) fields along the z-axis. The absorption coefficients were determined for transitions between the hole and electron ground states, considering z-polarized incident radiation. Including a magnetic field increases the transition energy, consequently causing the absorption peaks to shift toward the blue region of the spectrum. On the other hand, the electric field decreased the overlap of the electron and hole wavefunctions. As a result, the amplitude of the absorption peaks decreased with an increase in the electric field.
Keywords: type-II quantum dot; absorption coefficient; ZnTe/CdSe; CdSe/ZnTe; magnetic field; electric field type-II quantum dot; absorption coefficient; ZnTe/CdSe; CdSe/ZnTe; magnetic field; electric field

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MDPI and ACS Style

Toscano-Negrette, R.G.; León-González, J.C.; Vinasco, J.A.; Morales, A.L.; Mora-Ramos, M.E.; Duque, C.A. Effect of External Fields on the Electronic and Optical Properties in ZnTe/CdSe and CdSe/ZnTe Spherical Quantum Dots. Condens. Matter 2023, 8, 66. https://doi.org/10.3390/condmat8030066

AMA Style

Toscano-Negrette RG, León-González JC, Vinasco JA, Morales AL, Mora-Ramos ME, Duque CA. Effect of External Fields on the Electronic and Optical Properties in ZnTe/CdSe and CdSe/ZnTe Spherical Quantum Dots. Condensed Matter. 2023; 8(3):66. https://doi.org/10.3390/condmat8030066

Chicago/Turabian Style

Toscano-Negrette, Rafael G., José C. León-González, Juan A. Vinasco, Alvaro L. Morales, Miguel E. Mora-Ramos, and Carlos A. Duque. 2023. "Effect of External Fields on the Electronic and Optical Properties in ZnTe/CdSe and CdSe/ZnTe Spherical Quantum Dots" Condensed Matter 8, no. 3: 66. https://doi.org/10.3390/condmat8030066

APA Style

Toscano-Negrette, R. G., León-González, J. C., Vinasco, J. A., Morales, A. L., Mora-Ramos, M. E., & Duque, C. A. (2023). Effect of External Fields on the Electronic and Optical Properties in ZnTe/CdSe and CdSe/ZnTe Spherical Quantum Dots. Condensed Matter, 8(3), 66. https://doi.org/10.3390/condmat8030066

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