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Computation of the oscillator strength and absorption coefficients for the intersubband transitions of the spherical quantum dot
Scopus
Toplam 179 atıf DOI
The electronic structure and optical properties of one-electron Quantum Dot (QD) with and without an on-center impurity were investigated by assuming a spherically symmetric confining potential of finite depth. The energy eigenvalues and the state functions of QD were calculated by using a combination of Quantum Genetic Algorithm (QGA) and Hartree-Fock Roothan (HFR) method. We have calculated the binding energy for the states 1s,1p,1d,1f, oscillator strengths, the linear and third-order nonlinear optical absorption coefficients as a function of the incident photon energy and incident optical intensity for the 1s-1p, 1p-1d and 1d-1f transitions. The existence of the impurity has great influence on the optical absorption spectra and the oscillator strengths. Also we found that the magnitudes of the total absorption coefficients of the spherical QD increase for transitions between higher states. © 2009 Elsevier B.V. All rights reserved.
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The intersubband optical properties of a two-electron quantum dot-quantum well heterostructure
Scopus
Havuzumuzda 11 atıf almış
In this paper, both linear and third-order nonlinear optical properties of two-electron in a semiconductor core/shell/well/shell quantum dot (QD) heterostructure for cases with and without a hydrogenic donor impurity have been investigated in a detailed manner as depending on the structure parameters. For this purpose, first, the energy eigenvalues and corresponding wave functions of the structure have been computed as a function of the layer thicknesses by means of the self-consistent solution of the Poisson and Schrodinger equations in envelope function effective mass approximation. Second, using these energy eigenvalues and their wave functions obtained from the calculations, both linear and third-order nonlinear optical properties of the multi-shell QD (MSQD) with two-electron have been determined as a function of the photon energies and shell thicknesses. Also, all procedures mentioned above have been repeated for negatively charged donor impurity (<sup>D-</sup>) located in the center of the same structure. Finally, obtained results have been presented comparatively for cases with and without the impurity.
Atıf Yapan Makale Bilgileri
Kurumlar (2)
Abdullah Gül Üniversitesi
Kayseri, Turkey
Selçuk Üniversitesi
Selçuklu, Turkey