Effect of position-dependent effective mass on linear and nonlinear optical properties in a quantum dot

Khordad, R.

doi:10.1007/s12648-012-0100-8

Cited by 31 publications

(14 citation statements)

References 31 publications

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“…If E is the perpendicular electromagnetic field along the z axis, the Hamiltonian of system becomes H 0 + ezE(t) where where H 0 is the Hamiltonian of system without the electromagnetic field E(t). The linear and the third-order nonlinear optical RI of a spherical nano-system, within a two-level system, in a special case, from ground (ψ 100 ) to first allowed excited state (ψ 210 ) can be expressed as [26,29,35].…”

Section: Linear Nonlinear and Total Refractive Indexmentioning

confidence: 99%

Refractive index changes of multi-layered spherical nanostructures with donor impurity

Naimi

Jafari

2013

Physica B: Condensed Matter

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In this study, the linear, third-order nonlinear and total refractive index (RI) changes of multi-layered quantum dot (MLQD) and multi-layered quantum anti-dot (MLQAD) with a hydrogenic impurity are calculated. Our numerical results indicate that the RI changes are considerably sensitive to the geometrical parameters of systems and the incident optical intensity. It is observed that by changing the incident photon energy, the RI curves corresponding to MLQAD and MLQD are considerably different in shapes and behaviors. Generally, our results show that MLQAD models have very higher RIs than MLQD models.

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Section: Linear Nonlinear and Total Refractive Indexmentioning

confidence: 99%

Refractive index changes of multi-layered spherical nanostructures with donor impurity

Naimi

Jafari

2013

Physica B: Condensed Matter

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“…If E is the perpendicular electromagnetic field along the z axis, the Hamiltonian of system in this case is H 0 + ezE(t) where where H 0 is the Hamiltonian of system without the electromagnetic field E(t). The linear and third-order nonlinear optical absorption coefficients of a spherical nano-system, within a two-level system (in a special case, from ground state to first allowed excited state), can be expressed as [18,21,26] α (1)…”

Section: Linear and Nonlinear Absorption Coefficientsmentioning

confidence: 99%

Linear and nonlinear optical properties of multi-layered spherical nano-systems with donor impurity in the center

Jafari

Naimi

2013

J Comput Electron

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In this study, the linear, third-order nonlinear and total absorption coefficients (ACs) of multilayered quantum dot (MLQD) and multi-layered quantum anti-dot (MLQAD) with a hydrogenic impurity are calculated. The analytical and numerical solutions of Schrödinger equation for both MLQD and MLQAD, within the effective mass approximation and dielectric continuum model, are obtained. As our numerical results indicate, an increase in the optical intensity changes the total AC considerably, but the intensity range that leads to these changes is different for MLQAD and MLQD. It is observed that by changing the incident photon energy, the AC curves corresponding to MLQAD and MLQD are of different shapes and behaviors. The peak heights of AC curves corresponding to MLQAD are strongly affected by changing the core antidot radius and the shell thickness values, however in these cases no considerable changes are observed in peak heights of MLQD. Furthermore, in contrast to MLQAD, the photon energies corresponding to total AC peaks of MLQD are more affected by changing the confining potentials (CPs). keywords: Multi-layered quantum dots and anti-dots; Optical intensity; Linear and nonlinear absorbtion coefficients; Confining potential.

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“…[ 15 ] The number of studies that examine the properties of a spherical quantum dot having exponential PDM function can be increased. [ 16–18 ] Quantum dots with an infinite barrier in all these studies have been considered, and their common outcome is that, even if an electron with PDM does not have a confinement potential, it acts as if it is in a potential due to its PDM function, and the PDM function leads to the formation of bound states, and thus, parameters of PDM function crucially affect optical properties. When taking into consideration that the reason why a particle has effective mass is the total interactions in an environment, it is better understood that the PDM concept originates from the environment.…”

Section: Introductionmentioning

confidence: 99%

Optical analysis of quantum dot with velocity‐dependent potential

Bahar

Ungan

Kaya

et al. 2020

Int J of Quantum Chemistry

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In this study, for the first time, the velocity‐dependent potential (VDP) effects on the total refractive index changes (TRICs) and the total absorption coefficients (TACs) of the parabolic quantum dot with spherical confinement, generated by GaAs/GaAlAs heterostructure, are comprehensively investigated. In order to obtain the subband energy spectra and the electronic wave function of the quantum dot system, the wave equation is numerically solved due to the VDP's complexity by using Runge‐Kutta‐Fehlberg method within the effective mass approximation. The nonlinear optical specifications of the quantum dot with velocity‐dependent potential (QDVDP) are analyzed using the compact density matrix formalism within the framework of the iterative method. To investigate the optical specifications of QDVDP, the isotropic form factor of VDP is taken into consideration as the harmonic oscillator type, F(r) = γρ0r2 (being γ and ρ0 are constants). Optical analysis is also executed for parabolic encompassing under the influence of VDP, as well as VDP, analyzing for TRICs and TACs of QDVDP, for which the result is quite a change compared to cases without VDP due to the symmetry‐breaking repercussion on system confinement of VDP. The main motivation of the present study is to clearly distinguish VDP effects on optical properties of the quantum dot, carrying out an analysis on optimal range and alternative parameter for optical properties.

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Effect of position-dependent effective mass on linear and nonlinear optical properties in a quantum dot

Cited by 31 publications

References 31 publications

Refractive index changes of multi-layered spherical nanostructures with donor impurity

Refractive index changes of multi-layered spherical nanostructures with donor impurity

Linear and nonlinear optical properties of multi-layered spherical nano-systems with donor impurity in the center

Optical analysis of quantum dot with velocity‐dependent potential

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