We have studied the electronic properties and optical absorption spectra of three different cases of donor centers, D^{0}, D^{-} and D^{2-}, which are subjected to a perpendicular magnetic field, using the exact diagonalization method. The energies of the lowest lying states are obtained as function of the applied magnetic field strength B and the distance zeta between the positive ion and the confinement xy-plane. Our calculations indicate that the positive ion induces transitions in the ground-state, which can be observed clearly in the absorption spectra, but as zeta goes to 0 the strength of the applied magnetic field needed for a transition to occur tends to infinity.
@article{arxiv.cond-mat/0203398,
title = {Donor Centers and Absorption Spectra in Quantum Dots},
author = {Jaime Zaratiegui García and Pekka Pietiläinen and Petteri Hyvönen},
journal= {arXiv preprint arXiv:cond-mat/0203398},
year = {2007}
}