Electric field effect on the bound polaron in spherical quantum dots

Using a variational approach within the effective mass approximation, we ca lculated the binding energy of a bound polaron to shallow donor impurity in spherical Quantum Dots (QD), where a weak electric field is applied in the z-direction. The interactions of carrier charges (electron and ion) with t he longitudinal optical phonons as well as the surface optical phonons are considered. Calculations are made using a finite confinement potential. Res ults are obtained as a function of the dot size and the donor impurity posi tion for different electric field strengths. It is found that the binding e nergy is very sensitive to the polaronic effect, the confinement, and the e lectric field.