We propose that in the presence of an Ohmic, de-phasing type environment, a two-level-cavity system undergoes a quantum phase transition from a state with damped Rabi oscillation to a state without. We present the phase diagram and make predictions for pump and probe experiment. Such a strong coupling effect of the environment is beyond the reach of conventional perturbative treatment.
@article{arxiv.cond-mat/0703238,
title = {Phase Transition in a Two-level-cavity System in an Ohmic Environment},
author = {Chang-Qin Wu and Jian-Xin Li and Dung-Hai Lee},
journal= {arXiv preprint arXiv:cond-mat/0703238},
year = {2007}
}