Quantum Phase Transitions of Light in the Dicke-Bose-Hubbard model
Abstract
We extend the idea of quantum phase transitions of light in atom-photon system with Dicke-Bose-Hubbard model for arbitrary number of two-level atoms. The formulations of eigenenergies, effective Rabi frequencies, and critical chemical potentials for two atoms are derived. With a self-consistent method, we obtain a complete phase diagram for two two-level atoms on resonance, which indicates the transition from Mott insulator to superfluidity and with a mean excitations diagram for confirmation. We illustrate the generality of the method by constructing the dressed-state basis for arbitrary number of two-level atoms. In addition, we show that the Mott insulator lobes in the phase diagrams will smash out with the increase of atom numbers. The results of this work provide a step for studying the effects with combinations of Dicke-like and Hubbard-like models to simulate strongly correlated electron systems using photons.
Keywords
Cite
@article{arxiv.0709.1352,
title = {Quantum Phase Transitions of Light in the Dicke-Bose-Hubbard model},
author = {Soi-Chan Lei and Ray-Kuang Lee},
journal= {arXiv preprint arXiv:0709.1352},
year = {2009}
}