Exciton-Related Raman Scattering, Interband Absorption and Photoluminescence in Colloidal CdSe/CdS Core/Shell Quantum Dots Ensemble

Mantashian, Grigor A.; Mantashyan, Paytsar; Sarkisyan, H. A.; Kazaryan, É. M.; Bester, Gabriel; Baskoutas, Sotirios; Hayrapetyan, D. B.

doi:10.3390/nano11051274

Cited by 8 publications

(3 citation statements)

References 46 publications

(48 reference statements)

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“…For example, in solid-state physics, the Raman scattering peak's position, shape, and intensity can reveal information about a material's electronic structure and lattice dynamics. On the other hand, for a deeper knowledge of semiconductor nanostructures, the Raman differential effective cross-section computation continues to be a pretty intriguing and vital subject [43][44][45][46][47][48][49][50][51]. In [45], the authors studied the Raman scattering process connected to an exciton contained by a quantum dot using the matrix diagonalization approach within the effective-mass approximation.…”

Section: Introductionmentioning

confidence: 99%

Optical Properties of Conical Quantum Dot: Exciton-Related Raman Scattering, Interband Absorption and Photoluminescence

et al. 2023

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The current work used the effective mass approximation conjoined with the finite element method to study the exciton states in a conical GaAs quantum dot. In particular, the dependence of the exciton energy on the geometrical parameters of a conical quantum dot has been studied. Once the one-particle eigenvalue equations have been solved, both for electrons and holes, the available information on energies and wave functions is used as input to calculate exciton energy and the effective band gap of the system. The lifetime of an exciton in a conical quantum dot has been estimated and shown to be in the range of nanoseconds. In addition, exciton-related Raman scattering, interband light absorption and photoluminescence in conical GaAs quantum dots have been calculated. It has been shown that with a decrease in the size of the quantum dot, the absorption peak has a blue shift, which is more pronounced for quantum dots of smaller sizes. Furthermore, the interband optical absorption and photoluminescence spectra have been revealed for different sizes of GaAs quantum dot.

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Section: Introductionmentioning

confidence: 99%

Optical Properties of Conical Quantum Dot: Exciton-Related Raman Scattering, Interband Absorption and Photoluminescence

et al. 2023

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“…Another potential model is the Poeschel Teller potential. In the following articles, the electronic states in the presence of an impurity in the center, and exciton states in CdSe/CdS core/shell QDs were studied as well as Raman spectra due to excitons, spectra of interband and subband absorption, as well as photoluminescence 45,46 .…”

Section: Introductionmentioning

confidence: 99%

The contribution of edge number on the optical properties in ZnO pyramidal quantum dots

Mantashyan

2023

Quantum Optics and Photon Counting 2023

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Considerable advances in the growth process of quantum dots with non-trivial geometries have been obtained. These advances lead to countless applications in quantum optics, quantum information, and biophysics. However, the theoretical investigation of these objects is complex and analytically impossible in most cases. The investigation of pyramidal or conical quantum dots with a comparable height-to-base ratio is one of those problems. That is why the numerical finite element method in the framework of the envelope function approximation has been used to obtain the eigenvalues and eigenfunctions for ZnO pyramidal and conical quantum dots. The mesh domains required for the finite element method calculation were pyramidal domains with bases ranging from an equilateral triangle to an equilateral decagon. Cones were used for the approximation of the mesh objects for pyramidal quantum dots with a larger number of edges. Different head radius to height ratios (½, 1, 2, 3, 4) were considered. The optical transition energies were shown to decrease with the increase in the number of faces. The optical transition strengths were shown to exhibit the opposite behavior. The interband absorption curves generally exhibit a redshift with the increase in the number of edges.

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“…Exciton-related Raman scattering, interband absorption and photoluminescence in colloidal CdSe/CdS core/shell QD ensembles was investigated in [22]. It is very important to note that nonlinear optical effects can potentially be used in the creation of various next-generation optoelectronic devices [23].…”

Section: Introductionmentioning

confidence: 99%

Linear and Nonlinear Optical Absorption of CdSe/CdS Core/Shell Quantum Dots in the Presence of Donor Impurity

Mantashian

Zaqaryan

Mantashyan

et al. 2021

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Linear and nonlinear optical properties in colloidal CdSe/CdS core/shell quantum dots with different sizes have been theoretically investigated in the framework of effective mass approximation. The electron states in colloidal CdSe/CdS core/shell quantum dots have been calculated using the finite element method. The intraband linear and nonlinear absorption spectra have been calculated for colloidal CdSe/CdS core/shell quantum dots with different sizes. In addition, the dependences of the linear and nonlinear refractive index change on the incident light energy have been calculated. In the last section of the paper the second- and third-order harmonic generation spectra have been presented.

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Exciton-Related Raman Scattering, Interband Absorption and Photoluminescence in Colloidal CdSe/CdS Core/Shell Quantum Dots Ensemble

Cited by 8 publications

References 46 publications

Optical Properties of Conical Quantum Dot: Exciton-Related Raman Scattering, Interband Absorption and Photoluminescence

Optical Properties of Conical Quantum Dot: Exciton-Related Raman Scattering, Interband Absorption and Photoluminescence

The contribution of edge number on the optical properties in ZnO pyramidal quantum dots

Linear and Nonlinear Optical Absorption of CdSe/CdS Core/Shell Quantum Dots in the Presence of Donor Impurity

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