Nonlinear Optical Rectification and Oscillator Strength in a Spherical Quantum Dot with an Off-Center Hydrogenic Impurity in Presence of an Applied Electric Field

The binding energies of ground state and excited states and the second-order nonlinear optical rectification and oscillator strength in a spherical quantum dot having parabolic confinement with an off-center hydrogenic impurity under an applied electric field have been theoretically studied. In the calculations, a variational procedure was employed within the effective-mass approximation. We have found that the binding energies of the ground state (0s), the first and second excited states (1p, 2d), respectively, the second-order nonlinear optical rectification coefficient and oscillator strength for 0s - 1p and 1p - 2d transitions depend on the applied electric field. Moreover, the results demonstrate that the position of impurity has a great influence on the nonlinear optical rectification.