Influence of polaron on second and third harmonic generation of tuned quantum dot/ring systems

Abstract

In this work, optical properties of a tuned quantum dot/ring system with considering the electron–phonon (e-p) interaction are theoretically investigated. In particular, the second harmonic generation (SHG) and third harmonic generation (THG) of the system under e-p effect are determined. Here, we consider three phonon modes, longitudinal optical (LO), the surface optical (SO), and LO+SO phonons. First, the energy levels and the wave functions of the system are evaluated without e-p effect. Then, the SHG and THG are investigated with considering the LO e-p, SO e-p, and LO+SO e-p interactions. We have noticed that the e-p interaction has a great effect on the SHG and THG of our system. The effect of SO phonons on the obtained optical properties is more than the LO phonons. With considering the LO+SO-phonons, we obtain the largest influence on the optical properties.