Optical properties of a magneto-donor in a quantum dot

The optical-absorption spectra associated with transition between the ground state of a hydrogenic donor impurity to the second conduction levels in the presence of a magnetic field has been calculated for spherical CdSe quantum dot (QD) with infinite potential confinement, using a variational method and a perturbation method within the effective-mass approximation. We have found that as a consequence of the scaling laws, the absorption coefficient varies systematically as a function of QDs size. The application of the magnetic field may hinder the absorption coefficient of an on-center impurity and displace the threshold energy towards high energy if γ>1/R2 and towards low energy if γ<1/R2 for the 1s-2p− transition. For all values of the magnetic field, the threshold energy of the transition 1s-2p+ is displaced towards high energy.