Effects of hydrogenic impurity and external fields on the optical absorption in a ring-shaped elliptical quantum dot

Ghajarpour-Nobandegani, S.; Karimi, M.J.

doi:10.1016/j.optmat.2018.05.045

Cited by 37 publications

(6 citation statements)

References 31 publications

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“…fi In addition, the peak intensities decrease as the strength of the magnetic field becomes higher. The reason for this behavior is that the absolute value of the M fi decreases with g. These results are consistent with other previous published works in the case of an elliptical quantum dot structure [41]. All these explanations can be understood by observing the numerical results in figures 3(c)-(d).…”

Section: Resultssupporting

confidence: 92%

Magnetic field effect on the linear and nonlinear refractive index and optical absorption of a donor in a GaAs quantum ring

El-Bakkari¹,

Iqraoun

Jaouane³

et al. 2023

Phys. Scr.

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The effects of the magnetic field (γ), the radial position of impurity and the degree of confinement on the oscillator strength (OS), refractive index (Δn⁄n_r ) and optical absorption (α) of an impurity inside a GaAs quantum ring (QR) are explored using the effective mass approximation and variational method. It is shown that the peak position of the optical absorption and the refractive index decrease and move toward the lower incident photon energy as the strength of the γ increases. In addition, it is found that the strongest α relates to the case when the impurity is positioned at the right side of QR in the presence of the magnetic field. Our examinations also show that the oscillator strength decreases as the γ increases especially for an on-center donor impurity.

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Section: Resultssupporting

confidence: 92%

Magnetic field effect on the linear and nonlinear refractive index and optical absorption of a donor in a GaAs quantum ring

El-Bakkari¹,

Iqraoun

Jaouane³

et al. 2023

Phys. Scr.

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“…The analysis of optical behavior is crucial as it gives an insight into the intersubband transition in a controlled manner. The optical AC in a ring-shaped elliptical QD with the effects of hydrogenic impurity, electric and magnetic fields is presented in Reference [48]. Using the finite element method, they found that with the increasing electric field, the optical absorption increases for impurity situated at the center.…”

Section: Introductionmentioning

confidence: 99%

Quantum Confined Stark Effect on the Linear and Nonlinear Optical Properties of SiGe/Si Semi Oblate and Prolate Quantum Dots Grown in Si Wetting Layer

et al. 2021

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We have studied the parallel and perpendicular electric field effects on the system of SiGe prolate and oblate quantum dots numerically, taking into account the wetting layer and quantum dot size effects. Using the effective-mass approximation in the two bands model, we computationally calculated the extensive variation of dipole matrix (DM) elements, bandgap and non-linear optical properties, including absorption coefficients, refractive index changes, second harmonic generation and third harmonic generation as a function of the electric field, wetting layer size and the size of the quantum dot. The redshift is observed for the non-linear optical properties with the increasing electric field and an increase in wetting layer thickness. The sensitivity to the electric field toward the shape of the quantum dot is also observed. This study is resourceful for all the researchers as it provides a pragmatic model by considering oblate and prolate shaped quantum dots by explaining the optical and electronic properties precisely, as a consequence of the confined stark shift and wetting layer.

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“…This case prompted researchers to investigate optical phenomena such as optical absorption [27,28], optical rectification [29][30][31], second and thirdorder harmonic generations [32][33][34] and refractive index changes [35][36][37]. Optical absorption coefficients (OACs) of QDs which including impurity have different confinement potentials have been previously studied by many authors [38][39][40][41][42][43][44][45][46][47][48][49][50]. Optical properties of QDs are investigated for: a cylindrical core-shell QD by Kria et al [38], the spherical sector-shaped QD by Mora-Ramos et al [39], a laser-driven two-dimensional disc-shaped QD by Kilic et al [40], a spherical QD by Stevanović et al [41], a typical ring-shaped elliptical QD by Ghajarpour and Karimi [42], core-shell ellipsoidal QDs by Shi and Yan [43], a mul-tilayer QD by Rahul et al [44], a lens-shaped QD with a finite confinement potential by Khordad et al [45], a parabolic QD by Hosseinpour et al [46], two QDs coupled laterally with a circular cross-sectional shape by Duque et al [47], a pyramidal QD by Niculescu and Bejan [48], a triangular two-dimensional QD by Kasapoglu et al [49], a QD with Woods-Saxon potential by Lu et al [50].…”

Section: Introductionmentioning

confidence: 99%

Binding Energy And Absorption of Donor Impurity In Spherical GaAs/AlxGa1-x As Quantum Dots With Konwent Potential

Kasapoğlu

Sarı

et al. 2021

Preprint

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In this study, the electronic and optical properties of single or core/shell quantum dots, which are formed depending on the parameters in the selected Konwent potential, are investigated. Namely, the effects of the size and geometric shapes of quantum dots on the binding energy of the on-center donor impurity, the total absorption coefficient and refractive index which are including transitions between the some confined states, and the electromagnetically induced transparency between the lowest six confined states related to the donor impurity are investigated. We have used the diagonalization method by choosing a wave function based on the Bessel and Spherical Harmonics orthonormal function to find the eigenvalues and eigenfunctions of the electron confined within the quantum dots which have different types mentioned above. To calculate the optical absorption coefficients and electromagnetically induced transparency related to shallow-donor impurity, a two- and three-level approach in the density matrix expansion is used, respectively.

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Effects of hydrogenic impurity and external fields on the optical absorption in a ring-shaped elliptical quantum dot

Cited by 37 publications

References 31 publications

Magnetic field effect on the linear and nonlinear refractive index and optical absorption of a donor in a GaAs quantum ring

Magnetic field effect on the linear and nonlinear refractive index and optical absorption of a donor in a GaAs quantum ring

Quantum Confined Stark Effect on the Linear and Nonlinear Optical Properties of SiGe/Si Semi Oblate and Prolate Quantum Dots Grown in Si Wetting Layer

Binding Energy And Absorption of Donor Impurity In Spherical GaAs/AlxGa1-x As Quantum Dots With Konwent Potential

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