Photoionization cross section and refractive-index change of hydrogenic impurities in a CdS-SiO2 spherical quantum dot

Sait Yılmaz 1 , Haluk Şafak 2 , Recep Şahingoz 1 , and Mustafa Erol 1
  • 1 Faculty of Literature and Sciences, Department of Physics, Bozok University, 66200, Yozgat, Turkey
  • 2 Faculty of Literature and Sciences, Department of Physics, Selçuk University, 42075, Konya, Turkey

Abstract

In this study, we calculate the photoionization cross section and refractive-index change of an on-center hydrogenic impurity in a CdS-SiO2 spherical quantum dot. In numerical calculations, both the finite- and infinite-confinement cases are considered and a variational scheme is adopted to determine the energy eigenvalues for the impurity. The variations of the photoionization cross section with the dot radius, the refractive-index change, and the normalized photon energy are investigated, and the effect of the potential-barrier height on the cross section is discussed. The results obtained show that the photoionization cross section and the refractive-index change in CdS-SiO2 spherical quantum dots are sensitively dependent on the incident optical intensity and on the dot sizes.

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