Influence of the quantum well dielectric permittivity on the two-dimensional plasmon-phonon

Abstract

Abstract The work is devoted to a theoretical study of the effect of polarizability associated with quantum well lattice vibrations and filled electron bands on the properties of two-dimensional plasmon-phonons in InAs/AlSb and CdHgTe/CdTe single quantum well (QW) heterostructures. The spectra for the considered excitations are obtained without taking into account the spatial dispersion and with it taken into account in the framework of random phase approximation (RPA). The frequency dependence of the plasmon-phonon absorption coefficient is calculated. It is shown that taking into account the contribution of QW phonons and electrons of filled bands to the polarizability leads to the conclusion that there is a maximum frequency of plasmon-phonons and to the conclusion that the existence of plasmon-phonon modes requires that the electron mobility exceed a certain minimum value.