Stark shift of hydrogenic and non-hydrogenic donor impurity excited states in parabolic quantum dot: Under the effect of electric field and temperature

Abstract

Abstract In the present study, we discuss theoretically the influence of lateral and normal electric field on the hydrogenic donor impurity (HDI) and non-hydrogenic donor impurity (NHDI) excited state energies in a cylindrical quantum dot (CQD) with parabolic potential. The variational approach is employed to obtain the donor impurities ground and excited state energies in the framework of the effective mass approximation; consequently, the binding energy is calculated. The comparisons between the influence of the lateral and the normal electric fields on the Stark shift of the electron (ΔE1) and Stark shift of the HDI (ΔEimp) are given. It has been found that the direction of the electric field has a considerable effect on ΔEimp. Our results showed that ΔEimp has shown a blue shift for some HDI excited states and the other states showed a red shift. The results of the combined effect of the lateral electric field and the temperature on the HDI and NHDI binding energy have been presented. It has been indicated that the HDI states in small CQDs are very sensitive to the weak lateral electric field strength than both the normal electric field strength and the temperature values. More, the Stark shift in HDI ground state energy is more affected by the temperature in large CQDs than in small CQDs.