In this article simultaneous effects of external electric field and spin-orbit interaction on the linear and the nonlinear optical properties of a cubic quantum dot are studied. Based on the non-degenerate perturbation method, energy eigenvalues and eigenfunctions of the system under the influence of spin-orbit interaction are calculated. Furthermore, the linear and the nonlinear optical absorption coefficients and refractive index changes are obtained using the compact density matrix approach and iterative method. Our results show that, due to the spin-orbit interaction, resonant peak values of the optical absorption coefficients and refractive index changes decrease and occur at lower values of the incident photon energy. The variation of these optical parameters depend on the spin-orbit interaction strength, dot dimensions and external electric field.
The entanglement dynamics of spin-subbands states for an electron in a 1-Dimensional isotropic quantum wire, with an applied strong magnetic field and Rashba effect is studied. The parabolic confinement, produced by external gates and effects as a one dimensional isotropic harmonic oscillator, is also included. The measure of entanglement is calculated as a function of time by the von Neumann entropy and the time evolution operator. Our results indicate that, depending on the initial state of the subbands states the entanglement between the spin and structural subbands undergoes special periodic functions of time such as simple fluctuations or collapse and revival in the span of time. Also, it is shown that the period and amplitude of oscillations strongly depend on the external magnetic field strength which can be used as a parameter to control the degree of entanglement.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.