We report on the optical spectroscopy of the spin of two magnetic atoms (Mn) embedded in an individual quantum dot interacting with either a single electron, a single exciton and single trion. As a result of their interaction to a common entity, the Mn spins become correlated. The dynamics of this process is probed by time resolved spectroscopy, that permits to determine the optical orientation time in the range of a few tens of ns. In addition, we show that the energy of the collective spin states of the two Mn atoms can be tuned through the optical Stark effect induced by a resonant laser field.
@article{arxiv.1206.3491,
title = {Optical control of the spin state of two Mn atoms in a quantum dot},
author = {L. Besombes and C. L. Cao and S. Jamet and H. Boukari and J. Fernandez-Rossier},
journal= {arXiv preprint arXiv:1206.3491},
year = {2015}
}