Classical-field description of Bose-Einstein condensation of parallel light in a nonlinear optical cavity
Hui-Fang Wang(王慧芳)1, Jin-Jun Zhang(张进军)2,†, and Jian-Jun Zhang(张建军)2,‡
1 School of Chemistry and Material Science, Shanxi Normal University, Linfen 041004, China; 2 School of Physics and Information Science, Shanxi Normal University, Linfen 041004, China
Abstract We study the Bose-Einstein condensation of parallel light in a two-dimensional nonlinear optical cavity, where the massive photons are converted into photon molecules (p-molecules). We extend the classical-field method to provide a description of the two-component system, and we also derive a coupled density equation which can be used to describe the conversion relation between photons and p-molecules. Furthermore, we obtain the chemical potential of the system, and we also find that the system can transform from the mixed photon and p-molecule condensate phase into a pure p-molecule condensate phase. Additionally, we investigate the collective excitation of the system. We also discuss the problem how the spontaneous decay of an atom is influenced by both the phase transition and collective excitation of the coupling system.
Fund: Project supported by the Graduate Science and Technology Innovation Project of Shanxi Normal University (Grant No. 01053011) and the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program (Grant No. 1G2017IHEPKFYJO1).
Hui-Fang Wang(王慧芳), Jin-Jun Zhang(张进军), and Jian-Jun Zhang(张建军) Classical-field description of Bose-Einstein condensation of parallel light in a nonlinear optical cavity 2021 Chin. Phys. B 30 110301
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