Polaron effect on the binding energy of a hydrogenic impurity in GaAs-Ga 1-x Al x As superlattice

Abstract

The effect of the bulk Longitudinal-Optical (LO) phonon on the binding energy is investigated for a shallow donor impurity in a superlattice in the effective mass approximation by using the variational approach. The results are obtained as a function of parameters which characterize the superlattice and the position of the impurity center. The results show that the bulk Longitudinal-Optical (LO) phonon effect decreases by displacing the impurity from the center to the well boundary.