Exciton–LO phonon interaction in a quantum dot

Abstract

Exciton–LO phonon interaction in a spherical quantum dot embedded in non-polar matrix is studied using the dielectric continuum model and the intermediate-coupling-type theory. The interaction contribution can be divided into the self-energy-type and the screening-type terms. Both terms depend on the size of the quantum dot and tend to cancel especially much in the smaller dot. In the limit of the smaller dot both terms approach to zero and then effects of the exciton–LO phonon interaction vanish. These properties reflect the nature of the exciton–LO phonon interaction in the quantum dot.