Binding energy of excitons in an infinitely deep spherical quantum dot under intense THz laser field

Ouadgui, A; Diouri, J.; Khamkhami, J. El

doi:10.1007/s12043-019-1904-2

Cited by 5 publications

(5 citation statements)

References 10 publications

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“…For this reason, any change in the geometric confinement significantly affects the binding energy of exciton. We notice that the allure obtained in this case differs from that obtained in our previous work [16] for the infinite confinement and in which the curves of E b and are symmetrical. This symmetry is not verified in the current case of finite confinement (figures 1 and 3).…”

Section: Resultscontrasting

confidence: 96%

“…In this figure, we notice that the Coulomb interaction potential increases when R and increases, and tends towards the limit = 0, when tends towards ∞. The same result is obtained in reference [16]. Figure 4 shows that the kinetic energy T of the exciton decreases when the radius R of QD increases, and decreases almost linearly when <1, and remains almost constant when the laser field is more intense ( > 1).…”

Section: Resultssupporting

confidence: 81%

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Combined effects of intense THz laser field and applied electric field on binding energy of exciton in GaAs/ GaAlAs finite spherical quantum dot

J.Diouri,

A.Ouadgui,

J.Khamkhami

et al. 2023

IJERAT

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In this paper,we study the combined effects of intense THz laser field and electric field on the ground state binding energy of heavy hole excitons confined in GaAs/ GaAlAs spherical finite quantum dots. The formulation is based on the model of "laser dressed potential" which combines Coulomb interaction and field effect in only one potential as reported in the literature. The calculation is performed by using the variational method in the framework of the single band effective mass theory. Our results show that (i) The laser field increases the electron and hole confinement energy that form the exciton in the QD until they reach a maximum, then they become almost constant for a intense laser field., (ii)the electric field and the laser field lowers the binding energy for all quantum dot radii making the exciton stabilized and clustered near the center of the dot,iii)the laser field increases the spatial extention of exciton but the electric field deacreses it linearly.

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Section: Resultscontrasting

confidence: 96%

Section: Resultssupporting

confidence: 81%

Combined effects of intense THz laser field and applied electric field on binding energy of exciton in GaAs/ GaAlAs finite spherical quantum dot

J.Diouri,

A.Ouadgui,

J.Khamkhami

et al. 2023

IJERAT

View full text Add to dashboard Cite

show abstract

“…In this figure, we notice that the Coulomb interaction potential 𝑉 𝑐 increases when R and 𝛼 0 increases, and tends towards the limit 𝑉 𝑐 = 0, when 𝛼 0 tends towards ∞. The same result is obtained in reference [16]. Fig.…”

Section: Resultssupporting

confidence: 86%

“…Lima et al in the case of bulk exciton [10], (iii) for negligible confinement (R=3) and 𝛼 0 = 0 the binding energy approaches the limit value 1,75 R* instead of the expected value 1R* found by the same authors in the purely bulk exciton case [10]. It has been noticed that the allure obtained in this case differs from that obtained in our previous work [16] for the infinite confinement and in which the curves of Eb and 𝑉 𝑐 are symmetrical. This symmetry is not verified in the current case of finite confinement (Figs.…”

Section: Resultscontrasting

confidence: 61%

Combined Effects of Intense THz Laser Field and Applied Electric Field on Binding Energy of Exciton in GaAs/GaAlAs Finite Spherical Quantum Dot

J. Diouri,

A.Ouadgui,

J. Khamkhami

et al. 2023

J. Nanosci. Tech.

View full text Add to dashboard Cite

This paper describes the combined effects of intense THz laser field and electric field on the ground state binding energy of heavy hole excitons confined in GaAs/ GaAlAs spherical finite quantum dots. The formulation is based on the model of “laser dressed potential” which combines Coulomb interaction and field effect in only one potential as reported in the literature. The calculation is performed by using the variational method in the framework of the single band effective mass theory. Our results show that (i) the laser field increases the electron and hole confinement energy that form the exciton in the QD until they reach a maximum, then they become almost constant for an intense laser field, (ii)the electric field and the laser field lowers the binding energy for all quantum dot radii making the exciton stabilized and clustered near the center of the dot, and iii)the laser field increases the spatial extension of exciton but the electric field decreases it linearly.

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“…Ouadghi et al studied the E b of excitons in a simple QD under an ILF. They reported that the ILF lowers the excitonic E b [53]. The ILF effects on the exciton E b in QW were reported by Yesilgul et al; their results show that the ILF has a significant effect on the physical properties of an exciton in the QW [54].…”

Section: Introductionmentioning

confidence: 68%

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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Binding energy of excitons in an infinitely deep spherical quantum dot under intense THz laser field

Cited by 5 publications

References 10 publications

Combined effects of intense THz laser field and applied electric field on binding energy of exciton in GaAs/ GaAlAs finite spherical quantum dot

Combined effects of intense THz laser field and applied electric field on binding energy of exciton in GaAs/ GaAlAs finite spherical quantum dot

Combined Effects of Intense THz Laser Field and Applied Electric Field on Binding Energy of Exciton in GaAs/GaAlAs Finite Spherical Quantum Dot

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

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