Electric field effect on the photoionization cross section of a single dopant in a strained AlAs/GaAs spherical core/shell quantum dot

M’zerd, S; Haouari, Mohamed; Aghoutane, Mohamed; El-Yadri, M.; Feddi, E.; Dujardin, F.; Zorkani, Izeddine; Jorio, Anouar; Sadoqi, Mostafa; Long, Gen

doi:10.1063/1.5046859

Cited by 21 publications

(3 citation statements)

References 35 publications

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“…The EF effect on the fundamental state energy of a donor dopant within QD was examined by Feddi et al [51]. Additionally, M'zerd et al realized the EF effect on the PICS of a dopant in a CSQD; their results show that the PICS spectra exhibit a redshift when the EF is applied [52].…”

Section: Introductionmentioning

confidence: 99%

Intense Laser Field Effect on the Photo-Ionization Cross-Section of the First Exciton Transition in a Core/Shell Quantum Dot Submitted to an Applied Electric Field

et al. 2023

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In the current work, we study the intense laser pulse influences on the behaviors of the first excitonic transition in a core/shell quantum dot submitted to an electric field. Therefore, the exciton binding energy and the mean distance between the correlated electron–hole pair are discussed, considering the electric field and laser strength. Our calculations show that both external fields play significant repulsive effects. Through their effects, they oppose the attractive nature of the Coulomb potential between the correlated pair, which decreases the excitonic binding energy. We also analyze the dissociation process by determining the photo-ionization cross-section (PICS). Our findings show that the peaks of the PICS redshift when the shell thickness b−a increases. For a given core radius, the laser and electric field induce a shift toward the low-energy region for the PICS; this displacement is more pronounced for the laser case. Our study also compares simple quantum dots and core/shell quantum dots to show the effect of the inner radius on the obtained results. Our theoretical results can lead to promising applications of exciton-based devices controlled by sizes and external fields.

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Section: Introductionmentioning

confidence: 99%

Intense Laser Field Effect on the Photo-Ionization Cross-Section of the First Exciton Transition in a Core/Shell Quantum Dot Submitted to an Applied Electric Field

et al. 2023

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“…Li et al [16] calculated the electronic states of a hydrogenic donor impurity in lowdimensional semiconductor nanostructures in the framework of effective-mass envelope-function theory by using the plane wave method. Recently, impurity states in core/shell with different potential have been studied as well [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Optical Absorption Coefficient on-center donor impurity in a spherical core/shell quantum dots

et al. 2020

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The polaronic effect on the linear, third-order nonlinear and total optical absorption coefficients have been calculated in the case of GaAs/AlAs core/shell quantum dot, with the impurity is positioned at the central radial position of the GaAs shell. The calculations are realized in the framework of the effective mass approximation and the numerical results are obtained by using a variational method and an infinite confining potential. The results show that the polaronic effect has a great influence on optical properties of core/ shell quantum dot, he causes a red-shift of the nonlinear optical coefficients associated to light absorption. Also, the polaronic effect is enhanced with the decreasing of quantum dot radius.

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“…A number of theoretical investigations on the groundstate energy and wavefunctions of core/shell nanostructures have been carried out. [9][10][11] With the advent of various advanced fabrication processes, new types of core/shell nano-heterostructures have been produced using several combinations of group II to VI semiconductors. Core/shell quantum dot semiconductors can be employed in many potential applications, such as blue-emitting devices, photovoltaics, photosensitized solar cells, and light-emitting diodes.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Field Dependence of Excitonic and Optical Properties of InP/ZnS Core/Shell Nanostructure

Peter¹,

Elamathi²,

Lee

2020

Journal of Elec Materi

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The effect of a magnetic field on the excitonic and optical properties of an InP/ ZnS core/shell nanodot (type I) including the influence of the geometrical confinement effect has been investigated. The exciton binding energy, oscillator strength, linear and nonlinear electronic and optical absorption coefficients, electronic dipole moment, and optical gain are studied for different ratios of the core/shell dot radii with and without the application of a magnetic field. The variational formalism is employed to obtain the electronic properties, whereas a compact density matrix method is applied to determine the optical properties. It is observed that the exciton binding energy is enhanced as the core/shell ratio tends to unity, attempting to reach its well-known twodimensional (2D) limit. The application of a magnetic field shifts the peak to higher energies. The combined effects of a magnetic field and spatial confinement lead to control over the electronic as well as optical properties. These results will be useful for enhancing the performance of such structures for any desired potential application in optical devices.

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Electric field effect on the photoionization cross section of a single dopant in a strained AlAs/GaAs spherical core/shell quantum dot

Cited by 21 publications

References 35 publications

Intense Laser Field Effect on the Photo-Ionization Cross-Section of the First Exciton Transition in a Core/Shell Quantum Dot Submitted to an Applied Electric Field

Intense Laser Field Effect on the Photo-Ionization Cross-Section of the First Exciton Transition in a Core/Shell Quantum Dot Submitted to an Applied Electric Field

Optical Absorption Coefficient on-center donor impurity in a spherical core/shell quantum dots

Magnetic Field Dependence of Excitonic and Optical Properties of InP/ZnS Core/Shell Nanostructure

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