Donor impurity-related nonlinear optical rectification in a two-dimensional quantum ring under magnetic field

•Impurity-related optical rectification in 2D quantum ring under magnetic field is studied.•Fermi level and subbands electron density vary strongly with impurity position and magnetic field.•Optical rectification spectra are sensitive to impurity position and magnetic field intensity.•Red or blue shift of resonant peaks are induced by changes in field intensity or impurity position.

An investigation of the nonlinear optical rectification of a GaAs two-dimensional disc-shaped quantum ring with an off-center donor impurity under magnetic field has been performed by using a variational method in the effective mass approximation. The two-dimensional quantum ring was described by a pseudo-harmonic potential. The results are presented as functions of the incident photon energy for the different values of the impurity position and the magnetic field. It is found that the nonlinear optical rectification spectra are strongly affected by the position of the off-center impurity and the magnetic field.