Characteristics of harmonic and anharmonic spherical quantum dots modulated by structural parameters and hydrogenic impurity

In the present work, we explore the optical peculiarities of GaAs quantum dot (QD) built on harmonic and anharmonic confining potentials. Numerical results are made within parabolic band and effective mass (EM) theories. Using the well-known finite difference technique, we have computed the lowest energy levels and their probabilities. Afterwards, we have work out the amplitudes of the optical absorption coefficients (OACs) and discussed the influence of the hydrogenic impurity and confining potential’s parameters on the red or blue shifts presented by the system. Our findings prove that the optical and electronic characteristics of the structure we emphasis on can be modulated to attain a suitable optical absorption to specific needs or purposes by varying the potential’s parameters and the existence or absence of the hydrogenic impurity. The change of the potential’s parameters can generate two shapes of confining potentials (Harmonic and Anharmonic) which gives us more flexibility to tune and control the desired energy levels and per consequent to adjust and select the suitable OAC between the two lowest energy states (ground (1s) and first excited (1p)).