Laser-dressed donor states in a CdS/SiO2 spherical nanodot under applied electric fields

Niculescu, E.C.; Cristea, M.; Radu, A.

doi:10.1016/j.spmi.2014.01.023

Cited by 21 publications

(5 citation statements)

References 48 publications

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“…The appearance of a double potential well in the z direction is a characteristic known from the behavior of quantum wells when dressed with laser parameters that exceed the typical width of the confinement zone [34]. A similar behavior of the laser-dressed confinement potential was also reported for quantum wires [35][36][37] and quantum dots [38].…”

Section: Resultssupporting

confidence: 54%

Finite element 3D model of a double quantum ring: effects of electric and laser fields on the interband transition

Radu,

Stan,

Bejan

2023

New J. Phys.

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In this work, the changes in the energy of electrons and holes, oscillator strength and interband transition time when external fields are applied to a GaAs/AlGaAs semiconductor double ring grown by the droplet epitaxy technique are theoretically analyzed. We consider a static electric field and an intense laser field nonresonant with the quantum structure, with variable intensities and orientations with respect to the symmetry axis of the quantum ring (QR). In the formalism of the effective mass approximation for electrons and holes, the energies and wavefunctions were numerically computed using the finite element method implemented with an accurate three-dimensional model of the real QR. Laser dressing of the confining potential was performed using the exact integration formula at each point. Our results show major differences between the effects of the two types of applied fields, caused mainly by the static electric-field-induced strong polarizability of the confined electron-hole pair. In addition, the effects of both fields exhibit strong anisotropy in the electronic properties as a result of the particular flattened geometry of the QR. Proper combinations of field strengths and orientations are helpful in designing accurate tools for the sensitive manipulation of interband radiative properties.

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Section: Resultssupporting

confidence: 54%

Finite element 3D model of a double quantum ring: effects of electric and laser fields on the interband transition

Radu,

Stan,

Bejan

2023

New J. Phys.

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“…Using a perturbative method, Burileanu has investigated the behavior of the binding energy and photoionization cross-section of a donor impurity in spherical QD under the influence of electric and laser fields [29]. The ILF effect on the impurity states in a CdS/SiO 2 QD under applied electric field was studied within the effective massapproximation by using a finite difference method [30].…”

Section: Introductionmentioning

confidence: 99%

The effects of the intense laser and homogeneous electric fields on the electronic and intraband optical properties of a GaAs/Ga_0.7Al_0.3As quantum ring

Radu

Kirakosyan

Laroze

et al. 2015

Semicond. Sci. Technol.

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The simultaneous influences of an intense laser field and static electric field on one-electron states and intraband optical absorption coefficient are investigated in two-dimensional GaAs/Ga 0.7 Al 0.3 As quantum ring. An analytical expression of the effective confining potential in the presence of the external fields is obtained. The one-electron energy levels and wave functions are calculated using the effective mass approximation and an exact diagonalization technique. We show that changes in the incident light polarization lead to blue-or redshifts in the intraband optical absorption spectrum. Moreover, we found that blueshift and redshift are induced by the simultaneous influences of an intense laser and lateral electric fields. The obtained theoretical results indicate a novel opportunity to tune the performance of quantum rings and to control their specific properties by means of intense laser and homogeneous electric fields.

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“…CdS is an important II-VI semiconductor material with a wide band gap (Energy 2.53 eV), marvellous features in luminescence and photochemistry. Mixing SiO 2 with CdS nanoparticles is an apt candidate method to prevent decomposes, and improving luminescence performance and further functionalization [1][2][3][4][5][6][7][8][9][10][11][12][13]. The dual functional microencapsulated phase change materials modified CdS/SiO 2 dual-layered shell effectively utilized for degradation of methylene blue (MB) under natural sunlight illumination [14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization of porphyrin and CdS modified spherical shaped SiO2 for Reactive Red 120 degradation under direct sunlight

Krishnakumar

Ravikumar

Pandiyan

et al. 2020

Journal of Molecular Structure

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Laser-dressed donor states in a CdS/SiO2 spherical nanodot under applied electric fields

Cited by 21 publications

References 48 publications

Finite element 3D model of a double quantum ring: effects of electric and laser fields on the interband transition

Finite element 3D model of a double quantum ring: effects of electric and laser fields on the interband transition

The effects of the intense laser and homogeneous electric fields on the electronic and intraband optical properties of a GaAs/Ga_0.7Al_0.3As quantum ring

Synthesis, characterization of porphyrin and CdS modified spherical shaped SiO2 for Reactive Red 120 degradation under direct sunlight

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Laser-dressed donor states in a CdS/SiO2 spherical nanodot under applied electric fields

Cited by 21 publications

References 48 publications

Finite element 3D model of a double quantum ring: effects of electric and laser fields on the interband transition

Finite element 3D model of a double quantum ring: effects of electric and laser fields on the interband transition

The effects of the intense laser and homogeneous electric fields on the electronic and intraband optical properties of a GaAs/Ga0.7Al0.3As quantum ring

Synthesis, characterization of porphyrin and CdS modified spherical shaped SiO2 for Reactive Red 120 degradation under direct sunlight

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The effects of the intense laser and homogeneous electric fields on the electronic and intraband optical properties of a GaAs/Ga_0.7Al_0.3As quantum ring