Magnetic field effects on linear and nonlinear absorption and refractive index changes in various excited states of quantum dots

Abstract

This study focuses on the influence of magnetic fields on the optical properties of multilayered spherical quantum dots, with particular attention to linear and third-order nonlinear absorption and refractive index changes across different excited states. Using the finite element method, we systematically analyze how variations in magnetic field strength affect the optical responses of these nanostructures. The numerical calculations have been performed within the framework of the effective mass approximation. The results reveal that the magnetic field significantly alters both the magnitude and the spectral position of absorption peaks, as well as induces noticeable changes in the refractive index. These effects are strongly dependent on the quantum state under consideration, highlighting the sensitivity of optical properties to magnetic perturbations. This investigation provides deeper insight into the tunability of optical characteristics in quantum dots via external magnetic fields, offering valuable perspectives for the development of magneto-optical and optoelectronic devices.