Effects of hydrostatic pressure on intrawell and interwell excitons in a strained GaAs/GaAlAs double quantum well system

Angayarkanni, N.; Peter, A. John; Lee, Chang Woo

doi:10.1016/j.physe.2011.10.009

Cited by 4 publications

(3 citation statements)

References 30 publications

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“…The excitation of QDs can create an electron-hole correlated pair (exciton). From their extensive intervention in the optical process, the excitons offer a better comprehension of physical properties, such as excitonic binding energy (E b ) and photo-ionization cross-section (PICS), which is considered an important factor in the understanding of optoelectronic properties of these types of CSQD structures [21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

“…The magnetic field (B) impact on the PICS of exciton within quantum wire was discussed by Arunachalam et al [25]. Another study was carried out by Angayarkanni concerning the pressure-dependent PICS for an exciton in a QW; they found that well width and hydrostatic strain had a significant influence on the PICSs [26]. Isono et al realized the photo-ionization of the singlet exciton in single-crystal naphthalene; they showed that the cross-section increases monotonically with the photon energy [50].…”

Section: Introductionmentioning

confidence: 99%

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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%

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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“…N. Angayarkanni et al have studied the effect of laser field on the interband OACs in a strained GaAs/GaAlAs double QW system. The results show that the interband emission energy and the interband OACs depend strongly on the structure parameters of double QWs [18]. A. Keshavarz and N. Zamani have obtained the optimization of OACs in asymmetric double rectangular QWs by the use of the particle swarm optimization algorithm [19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Conduction Band Non-Parabolicity on the Nonlinear Optical Properties in GaAs/Ga1−xAlxAs Double Semi-V-shaped Quantum Wells

et al. 2018

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In this paper, we investigate the effect of conduction band non-parabolicity (NPBE) on the third harmonic generation(THG), the linear and nonlinear intersub-band optical absorption coefficients (OACs) related with electronic states of double semi-V-shaped GaAs/Ga1−xAlxAs quantum wells(QWs) by using the compact-density-matrix approach. Simultaneously, the work is performed in the position dependent effective mass in order to compute the electronic structure for the system by the finite difference and self-consistent techniques. We also compare the results with and without considering NPBE. It is found that: (1) the NPBE has a significant influence on the sub-band energy levels of double semi-V-shaped QWs, and (2) the amplitude and position of the resonant peaks of the THG and nonlinear OACs in the case of considering NPBE show complicated behavior due to the energy dependent effective mass m*(E) where the energy value was chosen self-consistently.

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Hydrostatic pressure and temperature effect on the nonlinear optical properties in semi-parabolic plus semi-inverse squared quantum well

Xu¹,

Zhen²,

Shi³

et al. 2021

Commun. Theor. Phys.

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In this study, the effects of hydrostatic pressure and temperature on nonlinear optical rectification (OR), second-harmonic generation (SHG), third-harmonic generation (THG) and the linear, nonlinear, and total optical absorption coefficients (OACs) of a semiparabolic plus semi-inverse squared quantum well (QW) are theoretically investigated. The results show that hydrostatic pressure and temperature have significant effects on the optical properties of semiparabolic plus semi-inverse squared QWs, and that the energy levels and magnitudes of the resonant peaks of OR, SHG, THG, and the total OACs vary according to the shape of the limiting potential, the hydrostatic pressure, and the temperature. It is easily seen that the peak positions of the resonant peaks of OR, SHG, THG, and the total OACs in the semiparabolic plus semi-inverse squared QW show a red shift with increasing hydrostatic pressure, but a blue shift with increasing temperature. Therefore, the magnitude and position of the resonant peaks of OR, SHG, THG, and the total OACs can be adjusted by changing the hydrostatic pressure and the temperature, which promise a new degree of freedom in the tunability of various electro-optical devices.

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Effects of hydrostatic pressure on intrawell and interwell excitons in a strained GaAs/GaAlAs double quantum well system

Cited by 4 publications

References 30 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

Effect of Conduction Band Non-Parabolicity on the Nonlinear Optical Properties in GaAs/Ga1−xAlxAs Double Semi-V-shaped Quantum Wells

Hydrostatic pressure and temperature effect on the nonlinear optical properties in semi-parabolic plus semi-inverse squared quantum well

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