Effect of magnetic field on the nonlinear optical properties of ZnO/Zn1−xMgxO pyramid quantum dots in the presence of an off-center impurity

Abstract

The present work explores the influence of magnetic field on the optical properties of $\mathrm{ZnO}/{\mathrm{Zn}}_{1-x}{\mathrm{Mg}}_{x}O$ pyramid quantum dot in the presence of an off-center donor atom. The theoretical study, carried out using the finite element method, reveals that the geometry of the quantum dot and the location of the impurity considerably affect the electron energies transition, oscillator strength and the optical absorption coefficients under the effect of the magnetic field. The results show that magnetic fields significantly modify energy transitions and linear and non-linear absorption coefficients. Also, the relative refractive coefficients have been affected by impurity position and magnetic field effect, which opened the way to advanced applications in optoelectronics, such as UV sensors and light-emitting diodes, where control of optical properties is essential to improve the performance of emerging technologies.