Effect of position-dependent effective mass on optical properties of spherical nanostructures

Naimi, Yaghoob; Vahedi, Javad; Soltani, M. R.

doi:10.1007/s11082-015-0183-5

Cited by 44 publications

(8 citation statements)

References 47 publications

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“…The said routes are prominently distinct in view of system‐noise interaction and often lead to different outcomes with respect to the noise‐free environment. The study analyses the OG profiles pursuing the variation of a handful of relevant physical parameters such as electric field ( F ), magnetic field ( B ), confinement potential (

ω_{0}

), dopant location (

r_{0}

), dopant potential (

V_{0}

), binding energy (BE), aluminum concentration ( y ) (considering

{Al}_{y} {Ga}_{1 - y} As

QD), [ 23 ] noise strength ( ζ ), position‐dependent effective mass (PDEM), [ 55–61 ] position‐dependent dielectric screening function (PDDSF), [ 55,62,63 ] geometrical anisotropy, [ 64–67 ] HP, and temperature ( T ). The study divulges the salient features of OG profile of doped QD under the supervision of noise when different physical parameters undergo gradual change.…”

Section: Introductionmentioning

confidence: 99%

Profiles of Optical Gain of Impurity‐Doped Quantum Dots under the Stewardship of Gaussian White Noise

Arif

Roy²,

Bera

et al. 2022

Physica Status Solidi (b)

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The optical gain (OG) of quantum dots containing impurity is dealt with in the present investigation under the governance of applied Gaussian white noise. In this regard, various pertinent physical parameters are varied over a range and the resulting variations of OG are thoroughly monitored. Along with OG, the profiles of the gain radiative current density and the bandgap are also analyzed. The authors have come across that the presence/absence of noise, the mode of application of noise (additive/multiplicative), the particular physical parameter concerned, and the range of magnitude of the physical parameter, in unison, govern the features of the OG profiles in diverse ways. The study reveals that tuning of various physical parameters under applied noise in some preferred mode can be useful for the attainment of high OG and saturation gain. Tuning of emission wavelength can also be exploited to design tunable light sources.

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ω_{0}

), dopant location (

r_{0}

), dopant potential (

V_{0}

), binding energy (BE), aluminum concentration ( y ) (considering

{Al}_{y} {Ga}_{1 - y} As

Section: Introductionmentioning

confidence: 99%

Profiles of Optical Gain of Impurity‐Doped Quantum Dots under the Stewardship of Gaussian White Noise

Arif

Roy²,

Bera

et al. 2022

Physica Status Solidi (b)

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“…[ 14 ] The absorption coefficients of a quantum dot with parabolic PDM function have been calculated by considering hydrogenic impurity at the center of the quantum dot. [ 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.…”

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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“…These two pathways differ from one another in view of the size of system-noise interaction, and thus we can expect different outcomes for applied additive noise and multiplicative noise in comparison with the noise-free ambience. The study explores the SQP profiles against the variation of a few relevant physical quantities such as electric field (F), magnetic field (B), confinement potential (ω 0 ), dopant location (r 0 ), dopant potential (V 0 ), BE, aluminium concentration (y) (considering doped Al y Ga 1Ày As QDs), [9] noise strength (ζ), position-dependent effective mass (PDEM), [52][53][54][55][56][57][58][59][60] position-dependent dielectric screening function (PDDSF), [52,54,61,62] geometrical anisotropy, [63][64][65][66] hydrostatic pressure (HP), [13,16,17,31,32,35,37,67,68] and temperature (T). [17,31,67,68] The findings of the study highlight the role of noise in designing the SQP profiles of doped QDs when different physical quantities undergo gradual change.…”

Section: Introductionmentioning

confidence: 99%

Profiles of Static Quadrupole Polarizability of Impurity‐Doped Quantum Dots Driven by Gaussian White Noise

Ghosh

Arif

Bera

et al. 2020

Physica Status Solidi (b)

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Herein, the influence of Gaussian white noise on static quadrupole polarizability (SQP) of the impurity‐doped quantum dots (QDs) is studied. The SQP profiles are critically analyzed as several physical quantities are varied over a range in the absence and presence of noise. The introduction of noise to the system is accomplished via two different routes viz. “additive” and “multiplicative.” SQP profiles consist of noticeable features like maximization, minimization, and saturation in the absence of noise and presence of additive noise. However, on most occasions, the SQP profile becomes devoid of any noticeable characteristics in the presence of multiplicative noise. The multiplicative noise plays some noticeable role only during the direct variation in confinement energy. Herein, the exclusive role of additive noise having strength around a typical value for the generation of large SQP is highlighted. The findings bear mentionable importance on the nonlinear optical properties of QD‐based devices under the aegis of noise.

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Effect of position-dependent effective mass on optical properties of spherical nanostructures

Cited by 44 publications

References 47 publications

Profiles of Optical Gain of Impurity‐Doped Quantum Dots under the Stewardship of Gaussian White Noise

Profiles of Optical Gain of Impurity‐Doped Quantum Dots under the Stewardship of Gaussian White Noise

Optical analysis of quantum dot with velocity‐dependent potential

Profiles of Static Quadrupole Polarizability of Impurity‐Doped Quantum Dots Driven by Gaussian White Noise

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