Exciton–LO-phonon interaction in zinc-compound quantum wells

Abstract

The properties of optical phonons and excitons in four zinc-compound quantum wells, in which the well layers are made of ternary mixed crystals, are investigated theoretically. The optical phonon frequencies and the electron--LO-phonon coupling constants of the well materials are calculated by using a mixed crystal theory. The interface optical phonon energies and dispersion relations, the exciton binding energies and the exciton--LO-phonon interaction energies are calculated as functions of the well width and the concentration x. The effects of the mixed crystal on the exciton--optical-phonon interaction in the quantum wells are discussed.