Optical and electronic properties of a two-dimensional quantum dot with an impurity

The binding energy and photoionization cross-section (PCS) in a two-dimensional pseudopotential, parabolic potential plus an inverse squared potential, quantum dot (QD) with a donor impurity subjected to a uniform magnetic field directed with respect to the z-axis have been investigated within the compact-density matrix formalism. The dependence of these optical properties on the confinement frequency of the parabolic potential, on the magnetic field and on the external field is studied in detail. Moreover, take into account the position-dependent effective mass and dielectric, the dependence of PCS on the dot radius is investigated. The results reveal that the binding energy and the PCS in a two-dimensional pseudopotential QD have been strongly affected by these factors, and the position effect also plays an important role in the PCS of the pseudopotential QD. In addition, the red-shift (blue-shift) of the PCS is found in this system because of the decreasing (increasing) energy difference between the final and initial states.