High pressure and polaron effects on optical properties of GaN wedge-shaped quantum dot

Abstract

In the paper, the optical properties of GaN wedge-shaped quantum dots under the influence of pressure and with electron-phonon (e-p) interaction are taken into account. To this end, we first exert a polarized monochromatic electromagnetic field on our system and theoretically consider intersubband transitions for the electrons. The energy difference and dipole matrix elements are evaluated by considering the effects of e-p and pressure. Then, the refractive index changes (RICs) and absorption coefficients (ACs) are calculated. It is deduced that the energy difference and dipole matrix elements reduce by considering the e-p and pressure effects. It results that the pressure enhances the e-p effect on the energy difference. The ACs and RICs move to lower energies considering the e-p and pressure effects. The RICs and ACs are increased in the presence of the e-p effect, whereas they are reduced with considering the pressure. Considering the e-p and pressure effects on total ACs, it is seen that the peak of AC splits into two peaks.