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

被引：0
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作者：
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
机构：
[1] Grupo de Materia Condensada-UdeA,
[2] Instituto de Física,undefined
[3] Facultad de Ciencias Exactas y Naturales,undefined
[4] Universidad de Antioquia UdeA,undefined
[5] Facultad de Ingeniería,undefined
[6] Universidad de Antioquia UdeA,undefined
[7] Department of Physics,undefined
[8] “Politehnica” University of Bucharest,undefined
[9] Universidad EIA,undefined
[10] Unidad Académica de Física,undefined
[11] Universidad Autónoma de Zacatecas,undefined
[12] Calzada Solidaridad esquina con Paseo la Bufa S/N,undefined
[13] C.P,undefined
[14] Instituto de Alta Investigación,undefined
[15] CEDENNA,undefined
[16] Universidad de Tarapacá,undefined
[17] Casilla 7D,undefined
[18] Institute of Research and Development,undefined
[19] Duy Tan University,undefined
[20] Division of Theoretical Physics,undefined
[21] Dong Thap University,undefined
[22] Centro de Investigación en Ciencias-IICBA,undefined
[23] Universidad Autónoma del Estado de Morelos,undefined
来源：
Scientific Reports | / 10卷
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摘要：
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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