Resonant Frequency of Impurity Polaron in a Quantum Well

Abstract

It is shown that the resonant frequency w* of a. ma.gnetopola.ion bound to a Coulomb impurity in a GaAs/Gai_! AIxAs quantum well is lower than that of longitudinal optical (LO) phonons owing to the effect of the Coulomb potential. Using MacDonald method to treat the Coulomb potential we come to the conclusion that w* is really below the frequency of LO phonons but not "pinning" at a frequency near that of TO phonons.