Optical properties of a quantum well with Razavy confinement potential: Role of applied external fields

Turkoglu, A.; Dakhlaoui, Hassen; Ungan, F.

doi:10.1016/j.physe.2021.114919

Cited by 20 publications

(6 citation statements)

References 28 publications

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“…1 F 1 (a, b, x) y 1 U 1 (a, b, x) son funciones hipergeométricas confluentes usadas en las partes interna y externa del cilindro, respectivamente. Aplicando condiciones de frontera a las funciones de onda descritas en la ecuación (8), se obtiene la ecuación trascendental que determina los valores de la energía E 1 para cada m. La solución de la ecuación (7) también es conocida [10] y para el estado base tiene la siguiente forma:…”

Section: Teoríaunclassified

“…Estas características aumentan la contribución de las partes no lineales en las constantes dieléctricas y en las propiedades ópticas [2]. Por lo anterior, en los últimos años ha aumentado el interés por investigar el efecto sobre las propiedades cuánticas de sistemas de baja dimensionalidad debido a la acción de agentes externos tales como la temperatura, la presión hidrostática, los campos eléctricos y los campos magnéticos, con el fin de desarrollar nuevas aplicaciones tecnológicas [3,4,5,6,7,8]. Esto ha permitido importantes avances teóricos y experimentales en la manipulación y optimización de la respuesta óptica en nano-estructuras.…”

Section: Introductionunclassified

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Estados 1s-like, 2p−-like y 2p+-like de una impureza hidrogenoide en un punto cuántico cilíndrico bajo la acción de un campo magnético aplicado

Portacio,

Rasero Causil,

Urango Baquero

2023

Cienc. En Desarro.

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Se estudia teóricamente los estados cuánticos de un punto cuántico cilíndrico, (CDQ) de GaAs/Ga0,6Al0,4As con una impureza hidrogenoide en su interior y bajo la acción de un campo magnético uniforme, aplicado en la dirección axial del cilindro. Usando el método variacional se encontraron las energías y las funciones de onda de los estados de impureza, 1s-like, 2p−-like y 2p+-like, cuando ella se mueve dentro del CQD. Se encontró que existe degeneramiento en la energía de la impureza para los estados 2p−-like y 2p+-like en ausencia de campo magnético. Este degeneramiento se rompe solo al aplicar un campo magnético, indicando un efecto Zeeman en el sistema, asì la variación de la intensidad del campo magnético permite sintonizar la condición resonancia de dos fotones.

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Section: Teoríaunclassified

Section: Introductionunclassified

Estados 1s-like, 2p−-like y 2p+-like de una impureza hidrogenoide en un punto cuántico cilíndrico bajo la acción de un campo magnético aplicado

Portacio,

Rasero Causil,

Urango Baquero

2023

Cienc. En Desarro.

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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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“…In addition, QDs are used in the creation of universal memory elements due to their spatial distribution of free carriers that are confined in three dimensions [5][6][7][8]. 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].…”

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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Optical properties of a quantum well with Razavy confinement potential: Role of applied external fields

Cited by 20 publications

References 28 publications

Estados 1s-like, 2p−-like y 2p+-like de una impureza hidrogenoide en un punto cuántico cilíndrico bajo la acción de un campo magnético aplicado

Estados 1s-like, 2p−-like y 2p+-like de una impureza hidrogenoide en un punto cuántico cilíndrico bajo la acción de un campo magnético aplicado

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

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