We report on the optical spectroscopy of a single InAs/GaAs quantum dot (QD) doped with a single Mn atom in a longitudinal magnetic field of a few Tesla. Our findings show that the Mn impurity is a neutral acceptor state A^0 whose effective spin J=1 is significantly perturbed by the QD potential and its associated strain field. The spin interaction with photo-carriers injected in the quantum dot is shown to be ferromagnetic for holes, with an effective coupling constant of a few hundreds of micro-eV, but vanishingly small for electrons.
@article{arxiv.0710.5389,
title = {Optically probing the fine structure of a single Mn atom in an InAs quantum dot},
author = {A. Kudelski and A. Lemaître and A. Miard and P. Voisin and T. C. M. Graham and R. J. Warburton and O. Krebs},
journal= {arXiv preprint arXiv:0710.5389},
year = {2009}
}