Figure 7.

The variation of the $|M_{12}{|}^2$ (a,b), and the transition energy (c,d), as a function of the electric field $F_z$, for transitions from the ground state ($|1\rangle$) to the first excited state ($|2\rangle$) with $m=0$, for an electron confined in a ZnS/CdS/ZnS spherical QD. (a,c) results without, and (b,d) with the effects of a donor impurity, located at the QD center, with $R_1=4$ nm, $R_2=11$ nm and $R_3=12$ nm, without external magnetic field effect.