Pyramidal core-shell quantum dot under applied electric and magnetic fields

J. A. Osorio; D. Caicedo-Paredes; J. A. Vinasco; A. L. Morales; A. Radu; R. L. Restrepo; J. C. Martínez-Orozco; A. Tiutiunnyk; D. Laroze; Nguyen N. Hieu; Huynh V. Phuc; M. E. Mora-Ramos; C. A. Duque

doi:10.1038/s41598-020-65442-x

Pyramidal core-shell quantum dot under applied electric and magnetic fields

J. A. Osorio
, D. Caicedo-Paredes
, J. A. Vinasco
, A. L. Morales
, A. Radu
, R. L. Restrepo
, J. C. Martínez-Orozco
, A. Tiutiunnyk
, D. Laroze
, Nguyen N. Hieu
, Huynh V. Phuc
, M. E. Mora-Ramos
, C. A. Duque

Universidad de Antioquia
National University of Science and Technology POLITEHNICA Bucharest
Universidad EIA
Universidad Autonoma de Zacatecas
Duy Tan University
Dong Thap University
Universidad Autonoma del Estado de Morelos

Research output: Contribution to journal › Article › peer-review

40 Scopus citations

Abstract

We have theoretically investigated the electronic states in a core/shell pyramidal quantum dot with GaAs core embedded in AlGaAs matrix. This system has a quite similar recent experimental realization through a cone/shell structure [Phys. Status Solidi-RRL 13, 1800245 (2018)]. The research has been performed within the effective mass approximation taking into account position-dependent effective masses and the presence of external electric and magnetic fields. For the numerical solution of the resulting three-dimensional partial differential equation we have used a finite element method. A detailed study of the conduction band states wave functions and their associated energy levels is presented, with the analysis of the effect of the geometry and the external probes. The calculation of the non-permanent electric polarization via the off-diagonal intraband dipole moment matrix elements allows to consider the related optical response by evaluating the coefficients of light absorption and relative refractive index changes, under different applied magnetic field configurations.

Original language	English
Article number	8961
Journal	Scientific Reports
Volume	10
Issue number	1
DOIs	https://doi.org/10.1038/s41598-020-65442-x
State	Published - 1 Dec 2020

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Osorio, J. A., Caicedo-Paredes, D., Vinasco, J. A., Morales, A. L., Radu, A., Restrepo, R. L., Martínez-Orozco, J. C., Tiutiunnyk, A., Laroze, D., Hieu, N. N., Phuc, H. V., Mora-Ramos, M. E., & Duque, C. A. (2020). Pyramidal core-shell quantum dot under applied electric and magnetic fields. Scientific Reports, 10(1), Article 8961. https://doi.org/10.1038/s41598-020-65442-x

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title = "Pyramidal core-shell quantum dot under applied electric and magnetic fields",

abstract = "We have theoretically investigated the electronic states in a core/shell pyramidal quantum dot with GaAs core embedded in AlGaAs matrix. This system has a quite similar recent experimental realization through a cone/shell structure [Phys. Status Solidi-RRL 13, 1800245 (2018)]. The research has been performed within the effective mass approximation taking into account position-dependent effective masses and the presence of external electric and magnetic fields. For the numerical solution of the resulting three-dimensional partial differential equation we have used a finite element method. A detailed study of the conduction band states wave functions and their associated energy levels is presented, with the analysis of the effect of the geometry and the external probes. The calculation of the non-permanent electric polarization via the off-diagonal intraband dipole moment matrix elements allows to consider the related optical response by evaluating the coefficients of light absorption and relative refractive index changes, under different applied magnetic field configurations.",

author = "Osorio, \{J. A.\} and D. Caicedo-Paredes and Vinasco, \{J. A.\} and Morales, \{A. L.\} and A. Radu and Restrepo, \{R. L.\} and Mart{\'i}nez-Orozco, \{J. C.\} and A. Tiutiunnyk and D. Laroze and Hieu, \{Nguyen N.\} and Phuc, \{Huynh V.\} and Mora-Ramos, \{M. E.\} and Duque, \{C. A.\}",

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AU - Osorio, J. A.

AU - Caicedo-Paredes, D.

AU - Vinasco, J. A.

AU - Morales, A. L.

AU - Radu, A.

AU - Restrepo, R. L.

AU - Martínez-Orozco, J. C.

AU - Tiutiunnyk, A.

AU - Laroze, D.

AU - Hieu, Nguyen N.

AU - Phuc, Huynh V.

AU - Mora-Ramos, M. E.

AU - Duque, C. A.

PY - 2020/12/1

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N2 - We have theoretically investigated the electronic states in a core/shell pyramidal quantum dot with GaAs core embedded in AlGaAs matrix. This system has a quite similar recent experimental realization through a cone/shell structure [Phys. Status Solidi-RRL 13, 1800245 (2018)]. The research has been performed within the effective mass approximation taking into account position-dependent effective masses and the presence of external electric and magnetic fields. For the numerical solution of the resulting three-dimensional partial differential equation we have used a finite element method. A detailed study of the conduction band states wave functions and their associated energy levels is presented, with the analysis of the effect of the geometry and the external probes. The calculation of the non-permanent electric polarization via the off-diagonal intraband dipole moment matrix elements allows to consider the related optical response by evaluating the coefficients of light absorption and relative refractive index changes, under different applied magnetic field configurations.

AB - We have theoretically investigated the electronic states in a core/shell pyramidal quantum dot with GaAs core embedded in AlGaAs matrix. This system has a quite similar recent experimental realization through a cone/shell structure [Phys. Status Solidi-RRL 13, 1800245 (2018)]. The research has been performed within the effective mass approximation taking into account position-dependent effective masses and the presence of external electric and magnetic fields. For the numerical solution of the resulting three-dimensional partial differential equation we have used a finite element method. A detailed study of the conduction band states wave functions and their associated energy levels is presented, with the analysis of the effect of the geometry and the external probes. The calculation of the non-permanent electric polarization via the off-diagonal intraband dipole moment matrix elements allows to consider the related optical response by evaluating the coefficients of light absorption and relative refractive index changes, under different applied magnetic field configurations.

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Pyramidal core-shell quantum dot under applied electric and magnetic fields

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