Intra-miniband absorption coefficient in GaAs/Al x Ga 1−x As core/shell spherical quantum dot

Rodríguez-Magdaleno, K.A.; Pérez‐Álvarez, R.; Martı́nez-Orozco, J.C.

doi:10.1016/j.jallcom.2017.11.091

Cited by 18 publications

(8 citation statements)

References 34 publications

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“…Singularities (or jumps) appearing on dynamic polarizability curves describe the frequency corresponding the energy difference in Eq. (12). As can be seen from Eq.…”

Section: Resultsmentioning

confidence: 81%

“…Ας ςαν βε ςλεαρλψ σεεν ιν Εχ. (12), ωηεν τηεην energy is equal to the energy differenceE n − E γ , the dynamic polarizability shows singularities for any electronic state n . This is particularly important in cavities where the symmetry breaking due to confinement leads to very close-nearly degenerate-atomic levels.…”

Section: Theorymentioning

confidence: 99%

“…Technologically, QDs have many potential uses in microelectronic and optoelectronic devices. In this respect, by employing different approaches and potential shapes, some researchers have studied the electronic structure, [2][3][4][5] binding energies, [6][7][8] optical properties, [9][10][11][12][13][14][15] electric and magnetic field effects, [16][17][18][19][20][21][22][23][24][25] and other physical properties [26][27][28][29][30] of single electron QDs. As well known, it is easy to obtain analytical solutions for QDs with one electron.…”

Section: Introductionmentioning

confidence: 99%

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Energy states, oscillator strengths and polarizabilities of many electron atoms confined by an impenetrable spherical cavity

Yakar¹,

Çakır²,

Özmen³

2020

Preprint

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The orbital, ground and excited state energies of many electron atoms confined by an impenetrable spherical cavity with radius R are calculated using Quantum Genetic Algorithm (QGA) approach and Hartree-Fock Roothaan (HFR) theory. The important properties such as static and dynamic polarizability, oscillator strength and static pressure are investigated as perturbative. The results reveal that cavity radius and impurity charge have played an important role on the polarizability, the oscillator strength and pressure of the system. In addition, it is seen that when cavity radius is extremely large, all energies and the other physical parameters approach the energies and physical parameters of unconfined atom. As the dot radius decreases, the polarizability of system because of the strong spatial confinement decreases, but the pressure exerting on the system as the cavity radius R is shrunk increases. In addition, as the impurity charge increases, the magnitude of the oscillator strength decreases.

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“…Singularities (or jumps) appearing on dynamic polarizability curves describe the frequency corresponding the energy difference in Eq. (12). As can be seen from Eq.…”

Section: Resultsmentioning

confidence: 81%

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Energy states, oscillator strengths and polarizabilities of many electron atoms confined by an impenetrable spherical cavity

Yakar¹,

Çakır²,

Özmen³

2020

Preprint

View full text Add to dashboard Cite

show abstract

“…Technologically, QDs have many potential applications in microelectronic and optoelectronic devices. In this respect, by employing different approaches and potential shapes, many researchers have studied the electronic structure [2–5], binding energies [6–8], optical properties [9–15], electric and magnetic field effects [16–25], and other physical properties [26–30] of single electron QDs. As well known, it is easy to obtain analytical solutions for single electron QDs.…”

Section: Introductionmentioning

confidence: 99%

Energy states, oscillator strengths and polarizabilities of many electron atoms confined by an impenetrable spherical cavity

Yakar

Çakır

Demir

et al. 2021

Int J of Quantum Chemistry

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We have calculated the ground and excited state energies and the orbital energies of three-electron atoms inside impenetrable spherical cavity. Energy eigenvalues and wavefunctions are calculated from the variational approximation method which is a combination of quantum genetic algorithm procedure and Hartree-Fock Roothaan method. In addition, the important parameters such as static and dynamic polarizability, oscillator strength and pressure have been investigated as perturbative. The results reveal that cavity radius and impurity charge have played an important role on the polarizability, the oscillator strength and pressure of the system. In addition, it is seen that when cavity radius is extremely large, all energies and the other physical parameters approach the values of a free space atom. As the dot radius decreases, the polarizability of system decreases due to the strong spatial confinement, but the pressure exerting on the system as the cavity radius R is shrunk increases. In addition, as the impurity charge increases, the oscillator strength decreases.

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“…The low-dimensional semiconductors have become an important issue in the Solid State Physics, due to their intrinsic physical properties and technological applications [1,2]. These low-dimensional systems (quantum wells, wires, and dots) offer a field of applications for optoelectronic and electronic devices [3,4]. Several papers on low-dimensional systems have been devoted to the delta-doping quantum wells, which was originally proposed in 80ʼs years by Wood et al [5].…”

Section: Introductionmentioning

confidence: 99%

Hydrostatic pressure and interlayer distance effects on non-linear optical proprieties in n-type double delta-doped GaAs quantum wells

2020

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Within the framework of the Thomas-Fermi theory, the electronic structure and the nonlinear optical properties in n-type GaAs double delta-doped quantum wells where determined. In particular, was studied the effects of the distance between the doping layers and the hydrostatic pressure on the absorption coefficient and the change in the refractive index. It was found that the interlayer distance has an important effect on potential geometry, while the pressure lowers the bottom of potential. It was found that the influence of the interlayer distance (hydrostatic pressure) generates a red-shift (blue-shift) on the absorption peak and the refractive index change node. The results indicate that the optoelectronic properties in small interlayer distances (25–50 Å) show a high sensitivity to the changes of hydrostatic pressure, whereas for distances larger than 100 Å the effects of hydrostatic pressure are unimportant for the 1-0 transition. On the far-infrared regime, the effects of these parameters can be applied to tuning the position and amplitude of the resonant optical signals.

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Intra-miniband absorption coefficient in GaAs/Al x Ga 1−x As core/shell spherical quantum dot

Cited by 18 publications

References 34 publications

Energy states, oscillator strengths and polarizabilities of many electron atoms confined by an impenetrable spherical cavity

Energy states, oscillator strengths and polarizabilities of many electron atoms confined by an impenetrable spherical cavity

Energy states, oscillator strengths and polarizabilities of many electron atoms confined by an impenetrable spherical cavity

Hydrostatic pressure and interlayer distance effects on non-linear optical proprieties in n-type double delta-doped GaAs quantum wells

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