Shallow donor inside core/shell spherical nanodot: Effect of nanostructure size and dielectric environment on energy spectrum

Chafai, A.; Dujardin, F.; Essaoudi, I.; Ainane, A.; Ahuja, Rajeev

doi:10.1016/j.spmi.2017.07.063

Cited by 19 publications

(3 citation statements)

References 25 publications

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“…In case of the absence of the impurity, U Coul is simply null. V(R s ) denotes the self-energy [39] which describes the electron self-polarization potential originating from the interaction of the electron with its image-charge. Its expression is given as follows :…”

Section: Description Of the Studymentioning

confidence: 99%

“…Afterwards, Cristea and Niculescu [36] have reported the electronic properties of a spherical Si QD with dielectric border, considering the dielectric mismatch at the core/shell interface, using a finite element method with triangular element and variable steps. Such kinds of systems with various material types such as inverted and non inverted CdSe/ZnS [37], type-I PbSe/CdSe CSQD [38] and recently, inverted and non inverted CdSe/ZnTe [39], have been subject of numerous studies taking into consideration various types of external constraints. Chafai et al [19] have focused their attention on the effects of the magnetic field on energy levels and ground state binding energies of a CdSe/ZnTe CSQD with an on-center hydrogenic impurity; they found a noticeable modification of those properties as a result of the external magnetic field action notably the increase of the electron energy.…”

Section: Introductionmentioning

confidence: 99%

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Binding energies, oscillator strengths of core/shell spherical quantum dots with or without on- or off-center donor impurities under an external magnetic field

Aboulaï¹,

Melono²,

Doba³

et al. 2022

Phys. Scr.

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Non-relativistic energy levels, binding energies and oscillator strengths of CdSe⁄ZnT e core/shell spherical quantum dots with or without impurities submitted to an external magnetic ﬁeld have been investigated by using a B-spline based variational method, within the framework of the eﬀective mass approximation. In the case where the system contains hydrogenic impurity, the eﬀects of its oﬀ-center displacement combined to the height of the conﬁning potential have also been studied. The dielectric constant as well as the eﬀective mass are considered to be dependent on the radius. The modiﬁcations occurring due to the presence of the magnetic ﬁeld have been analyzed. We have found that the electronic and optical properties are strongly aﬀected by the magnetic ﬁeld strength, the spatial conﬁnement and the oﬀ-center displacement. The oscillator strengths and the binding energies increase with the magnetic ﬁeld, but its eﬀect on the binding energies (both ground and excited states) is dimmed by the reduction of the core-to-shell radii ratio and the increase of the oﬀ-center displacement to the vicinity of the shell. However, the oscillator strengths increase with the magnetic ﬁeld when the oﬀ-center displacement increases towards the shell.

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Section: Description Of the Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Binding energies, oscillator strengths of core/shell spherical quantum dots with or without on- or off-center donor impurities under an external magnetic field

Aboulaï¹,

Melono²,

Doba³

et al. 2022

Phys. Scr.

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“…Here F is the electric filed and ∑ represents the self-energy term due to the polarization generated by charging the QD with the dielectric matrix. The analytical expression of the self-energy is taken from [33,34]:…”

Section: Theoretical Model and Computational Detailsmentioning

confidence: 99%

External electric field effect and impact of encapsulating matrix on optical and electronic properties within CdSe/ZnSe core/shell QDs

Jbeli¹,

Yahyaoui²,

Zeiri³

et al. 2021

Phys. Scr.

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In this study, we have carried out a theoretical investigation of CdSe/ZnSe core/shell spherical quantum dot (CSQD) embedded in different dielectric matrix. The effect of surrounding matrix and the external electric field on the linear and third-order nonlinear real and imaginary parts of the dielectric function have been simulated numerically using the effective mass approximation and taking into account the compact density matrix approach. The electronic band structure and corresponding wave functions were calculated by solving the Schrödinger equation in the framework evoked previously. The study revealed a significant blue shift of the transition energies under electric field offering the possibility of adjusting them. In addition, by varying the dielectric matrices enveloping our main structure, it was also found that the choice of the pattern of the matrix is fundamental for the manipulation of the resonance peak energies of the dielectric function. RECEIVED

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Consequences of dielectric mismatch on linear and third order nonlinear optical properties for CdS/ZnSe core/shell QD-matrix

et al. 2020

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Shallow donor inside core/shell spherical nanodot: Effect of nanostructure size and dielectric environment on energy spectrum

Cited by 19 publications

References 25 publications

Binding energies, oscillator strengths of core/shell spherical quantum dots with or without on- or off-center donor impurities under an external magnetic field

Binding energies, oscillator strengths of core/shell spherical quantum dots with or without on- or off-center donor impurities under an external magnetic field

External electric field effect and impact of encapsulating matrix on optical and electronic properties within CdSe/ZnSe core/shell QDs

Consequences of dielectric mismatch on linear and third order nonlinear optical properties for CdS/ZnSe core/shell QD-matrix

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