Heavily enhanced dynamic Stark shift in a system of Bose-Einstein condensation of photons

School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China(Dated: December 12, 2013)The dynamic Stark shift of a high-lying atom in a system of Bose-Einstein condensation (BEC)of photons inside a two-dimensional microcavity is discussed within the framework of nonrelativisticquantum electrodynamics (QED) theory. It is found that the Stark shift of an atom in BECof photons is modified by a temperature dependent factor F