Behavior of Donor Impurity Binding Energy Confined In a GaAs Constant Total Effective Radius Multi-Shell Quantum Dots: Dielectric Mismatch Effects

Abstract

In this work, we have studied the effects of the number of wells, quantum dot thickness, and dielectric mismatch on binding energy of a single-donor impurity which confined in GaAs constant total effective radius multi-shell quantum dots. We have found an oscillating binding energy when numbers of wells increase. Oscillations of 1s and 2s binding energies have 180° phase difference, while 1s and 3s binding energies oscillate in phase. When outer quantum dot radius R 2 increases, the amplitudes of the oscillations decreases, while by going from 1s to 3s, the amplitudes of the oscillations increase. When ɛ 2/ɛ 0 increases, the impurity binding energy decreases. Finally, we have shown that effect of the dielectric mismatch is larger for systems with smaller outer quantum dot radius R 2.