Electronic states and optical characteristics of GaAs Spherical quantum dot based on Konwent-like confining potential: Role of the hydrogenic impurity and structure parameters

Dakhlaoui, Hassen; Belhadj, W.; Musa, M.O.; Ungan, F.

doi:10.1016/j.ijleo.2023.170684

Cited by 8 publications

(3 citation statements)

References 37 publications

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“…Among the well-known DWP models are the symmetric-hyperbolic DWP including the Razavy bistable potential (RBP) which successfully described molecular torsion oscillations with 𝑛 and 2𝑛-fold resistance [11], the Konwent potential which successfully modeled nucleons in the nucleus [12], and the double sinh Gordon (DSHG) potential which was applied to sink and anti-sink calculations in thermodynamics [13]. Nowadays, hyperbolic DWPs are used to investigate the electrical and optical properties in semi conductor by investigating the role of structure parameters [14][15][16], applied external fields [17][18][19][20] and applied magnetic fields [21]. Despite having many possible applications, the solutions of symmetric-hyperbolic DWP are not complete, where quasi-exact solvable (QES) of the eigen-energies and eigenfunctions have been obtained for some limited lowest states only [11][12][13]22].…”

Section: Introductionmentioning

confidence: 99%

Estimation of Energy Separation in Tunelling States in Symmetric-Hyperbolicus Double-Well Potential Problem using Filter Method

Abdurrouf,

Saroja,

Nurhuda

2024

Trends Sci

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Double well potential (DWP) plays an important role in quantum physics but its analytical exact solutions are incomplete, except for some limited quasi-exact solvable (QES) and therefore numerical solutions are still required. This paper is aimed to obtain numerical solution of the recently proposed symnetric-hyperbolicus DWP and by using our newly developed filter method. The filter method is able to produce eigen-energies and eigenfunctions those are in accordance with the exact analytical results. Next, we obtain the dependence of the ground state energy and the energy separation between the 2 lowest states on the DWP parameter k. For large k, the 2 lowest energy levels are below the potential barrier so the eigenfunctions penetrate the barrier, so the 2 lowest energy levels can be considered as the result of a single energy split. In this case, we observe that the energy separation is an exponential function k, as opposed to a linear function for smaller k in the non tunelling region. The exponential trend of the numerical results is in good agreement with the theoretical approach and allows one to estimate the 2 lowest energies for a given k. HIGHLIGHTS For small , the two lowest energy levels lie above the barrier potential, where both ground state and the energy separation is a linier function of For large , the two lowest energy levels lie below the barrier potential so that the eigenfunction penetrates the barrier. As a result, the two lowest energy levels can be thought of as splitting energy states. In this case, we observe that the energy separation is an exponential function . Since also depends on , it is possible to estimate the two lowest energy levels The exponential trend of the numerical results for large agrees well with the theoretical approach, shown by the linear relationship between and the classical actions in the classical forbidden regions, GRAPHICAL ABSTRACT

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Section: Introductionmentioning

confidence: 99%

Estimation of Energy Separation in Tunelling States in Symmetric-Hyperbolicus Double-Well Potential Problem using Filter Method

Abdurrouf,

Saroja,

Nurhuda

2024

Trends Sci

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“…Generally, the position of different energy levels is determined via the geometrical shape of the confining potential of the quantum structure, such as square, parabolic, semi-parabolic, Gaussian, Razavy, Konwent, and Manning shapes [9][10][11][12][13][14]. QDs are of particular interest in optical applications due to their luminescence, potential to emit different frequencies with intense efficacies, high extinction, and prolonged lifetimes [15][16][17]. For these reasons, QDs are used in other technological applications such as light-emitting diodes (LEDs), electronic transistors, medical laser imaging, biosensors, quantum cascade lasers, and quantum computing architectures [18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

GaAs Quantum Dot Confined with a Woods–Saxon Potential: Role of Structural Parameters on Binding Energy and Optical Absorption

Dakhlaoui,

Belhadj,

Elabidi

et al. 2023

Inorganics

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We present the first detailed study of optical absorption coefficients (OACs) in a GaAs quantum dot confined with a Woods–Saxon potential containing a hydrogenic impurity at its center. We use a finite difference method to solve the Schrödinger equation within the framework of the effective mass approximation. First, we compute energy levels and probability densities for different parameters governing the confining potential. We then calculate dipole matrix elements and energy differences, E1p−E1s, and discuss their role with respect to the OACs. Our findings demonstrate the important role of these parameters in tuning the OAC to enable blue or red shifts and alter its amplitude. Our simulations provide a guided path to fabricating new optoelectronic devices by adjusting the confining potential shape.

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“…Quantum confinement effects, a unique aspect of LDSs, can greatly modify the electronic and optical properties of materials [13]. Among of these LDSs, quantum dots, including spherical quantum dots (SQDs), exhibit optical properties depending on their size, attributed to quantum confinement [14]. As the dimensions of quantum dots reduce, the bandgap increases, resulting in a blue shift in absorption and emission spectra.…”

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confidence: 99%

Two-photon absorption in quantum dots with Hellmann potential

Hieu,

Dinh,

Poklonski

et al. 2024

Phys. Scr.

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We study the nonlinear optical absorption properties of a spherical quantum dot with Hellmann potential, focusing on the two-photon absorption (TPA) process, using GaAs/AlGaAs material as an example. { The radial Schr"{o}dinger equation is solved using the Nikiforov-Uvarov method, while the two-photon absorption coefficient is determined through second-order perturbation theory concerning the electron-photon interaction}. Our study shows that the intraband transition has a smaller energy transition than the interband transition, leading to TPA spectra for the intraband transition that is restricted within a smaller energy range and exhibits a higher peak value than those for the interband transition. The peak corresponding to $\ell=2$ consistently appears to the left of the peak corresponding to $\ell=1$ in both intraband and interband transition cases. Additionally, the dependence of the absorption peak position on the order of transition, $n$, differs between intra- and inter-band transitions. We also observe blue shift behavior in the TPA spectra as all three parameters, $r_0$, $V_{0e}$, and $\eta$, increase. Our investigation has the potential to enable the design of novel photonic devices, ultra-fast optical switches, and highly efficient solar cells through the optimization of quantum dot material properties.

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Electronic states and optical characteristics of GaAs Spherical quantum dot based on Konwent-like confining potential: Role of the hydrogenic impurity and structure parameters

Cited by 8 publications

References 37 publications

Estimation of Energy Separation in Tunelling States in Symmetric-Hyperbolicus Double-Well Potential Problem using Filter Method

Estimation of Energy Separation in Tunelling States in Symmetric-Hyperbolicus Double-Well Potential Problem using Filter Method

GaAs Quantum Dot Confined with a Woods–Saxon Potential: Role of Structural Parameters on Binding Energy and Optical Absorption

Two-photon absorption in quantum dots with Hellmann potential

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