The inter-sublevel optical properties of a spherical quantum dot-quantum well with and without a donor impurity

摘要

In this study, we have investigated the inter-sublevel optical properties ofa core/shell/well/shell spherical quantum dot with the form of quantumdot-quantum well heterostructure. In order to determine the energy eigenvaluesand corresponding wave functions, the Schr\"{o}dinger equation has been solvedfull numerically by using shooting method in the effective mass approximationfor a finite confining potential. The inter-sublevel optical absorption and theoscillator strength between ground ($1s$) and excited ($1p$) states have beenexamined based on the computed energies and wave functions. Also, the effect ofa hydrogenic donor impurity, located at the center of the multi-shell sphericalquantum dot (MSQD), has been researched for different core radii ($R_1$), shellthicknesses ($T_s$) and well widths ($T_w$) in certain potential. It isobserved that the oscillator strengths and the absorption coefficients arestrongly depend on the core radii and layer thicknesses of the MSQD.