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

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.

Automated summary

In this work, the optical properties of a tuned quantum dot/ring system with consideration of the electron-phonon interaction were theoretically investigated, particularly focusing on the second harmonic generation (SHG) and third harmonic generation (THG) under the e-p effect. The study revealed that the e-p interaction significantly influences the SHG and THG of the system, with the surface optical (SO) phonons having a greater impact on the optical properties compared to the longitudinal optical (LO) phonons. Additionally, the combined effect of LO and SO phonons resulted in the largest influence on the optical properties.