The electric field, temperature and pressure effects on the electronic and optic properties of spherical quantum dot

The influence of an external electric field, temperature and hydrostatic pressure on the electronic, the linear and nonlinear optical properties of the ground state and excited states for spherical quantum dot (QD) with parabolic confinement is investigated theoretically. The energy levels and wave functions of the QDs are calculated using by variational method within the effective-mass approximation. The results show that these external factors have a significant effect not only on binding energy of the donor impurity but also on the optical characteristics of the system. In addition, the THG coefficient also depends on the relaxation rate of the spherical QD with parabolic confinement and the position of impurity. Moreover, it is found that the total absorption coefficient is strongly affected by the existence of impurity, the incident optical intensity, and relaxation time.