Confined LO phonons effects on the binding energy of a hydrogenic impurityin a superlattice

Studied in this paper is the confined Longitudinal-Optical (LO) phonon effe ct on the binding energy of shallow donor impurity in a superlattice. Calcu lations are made using the effective mass approximation within the variatio nal approach for a superlattice potential described by the Kroning-Penny mo del. Our results are obtained as a function of parameters which characterize the superlattice and the position of the impurity center. The present results can be useful in understanding the spatial distribution of the donor center in a superlattice.