Effects of Magnetic Field on Nonlinear Optical Absorption in Quantum Dots Under Parabolic-Inverse Squared Plus Modified Gaussian Potential

The effects of some factors on linear and nonlinear optical absorption (OA) coefficients for GaAs/Ga 1 - x Al x As quantum dots (QDs) under parabolic-inverse squared (PIS) plus modified Gaussian (MG) potential in a vertical magnetic field are theoretically investigated, such as Al concentration, magnetic field, the depth of potential and so on. The analytical expressions of the linear and nonlinear OA coefficients are deduced by the compact density matrix formalism. The results show that these structural parameters and external factors, such as the depth of potential and magnetic field, have obvious effects on the dipole matrix elements, energy level interval and so on. Therefore, these factors will have a great impact on the change trend of OA coefficients. Furthermore, the incident optical intensity has an effect on the nonlinear OA coefficient.