Electric field effect on the photoionization cross section of a single dopant in a strained A l A s / G a A s spherical core/shell quantum dot

2018 ◽  
Vol 124 (16) ◽  
pp. 164303 ◽  
Author(s):  
S. M’zerd ◽  
M. El Haouari ◽  
M. Aghoutane ◽  
M. El-Yadri ◽  
E. Feddi ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Electric Field ◽  
Cross Section ◽  
Field Effect ◽  
Photoionization Cross Section ◽  
Core Shell ◽  
Electric Field Effect ◽  
Spherical Core

Photoionization cross section and binding energy of single dopant in hollow cylindrical core/shell quantum dot

2017 ◽  
Vol 121 (6) ◽  
pp. 064303 ◽  
Author(s):  
E. Feddi ◽  
M. El-Yadri ◽  
F. Dujardin ◽  
R. L. Restrepo ◽  
C. A. Duque
Keyword(s):  
Binding Energy ◽  
Quantum Dot ◽  
Cross Section ◽  
Photoionization Cross Section ◽  
Core Shell

Energetic behavior of excitons in hybrid organic–inorganic parabolic quantum dots and its electric field dependence

2015 ◽  
Vol 29 (30) ◽  
pp. 1550211 ◽  
Author(s):  
Rym Ridene ◽  
Nouha Mastrour ◽  
Dhouha Gamra ◽  
Habib Bouchriha
Keyword(s):  
Experimental Data ◽  
Quantum Dots ◽  
Quantum Dot ◽  
Electric Field ◽  
Field Dependence ◽  
Field Effect ◽  
Electric Field Effect ◽  
Electric Field Dependence ◽  
The Individual ◽  
Excitonic States

In this paper, dispersion energies of Wannier–Mott, Frenkel and mixed exciton formation at the interface in nanocomposite organic–inorganic parabolic quantum dots are investigated theoretically taking account of the interaction between the two excitonic states and electric field effect. Illustration is given for three nanocomposites highly studied experimentally, such as organic P3HT combined respectively with inorganic (CdSe, ZnSe, ZnO) parabolic quantum dots. It is shown that the parameter governing the interaction between the individual exciton states depends on the inorganic quantum dot and can be controlled by the electric field. The results are consistent with the available experimental data.

Binding energies and photoionization cross-sections of donor and acceptor impurities in inverted core/shell ellipsoidal quantum dots: Effects of magnetic field, ellipsoid anisotropy and impurity position

2019 ◽  
Vol 33 (13) ◽  
pp. 1950131 ◽  
Author(s):  
Lei Shi ◽  
Zu-Wei Yan
Keyword(s):  
Magnetic Field ◽  
Quantum Dot ◽  
Cross Section ◽  
Cross Sections ◽  
Applied Magnetic Field ◽  
Photoionization Cross Section ◽  
Binding Energies ◽  
Core Shell ◽  
Perturbation Approach ◽  
Donor And Acceptor

Within the framework of the effective-mass approximation and by using a variational and perturbation approach, the binding energies and photoionization cross-sections of donor and acceptor impurities in an inverted core/shell ellipsoidal spherical quantum dot under an applied magnetic field have been studied. We have calculated the binding energies of both donor and acceptor impurities as a function of the core and shell sizes and shapes with different impurity positions under the applied magnetic field. In addition, the corresponding photoionization cross-section is calculated. Our results show that the binding energy of the acceptor impurity is larger than that of the donor impurity, and both of them with different impurity positions and quantum ellipsoid anisotropies will exhibit a nonmonotonic change. The peak value of the photoionization cross-section will reach a maximum with the increasing ratio R1/R2. It is found that the applied magnetic field can be an effective means of enhancing the photoionization cross-section of an impurity state in such core/shell quantum dot system.

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