Quantum Phase Transitions of Light in the Dicke-Bose-Hubbard model

Details Quantum Phase Transitions of Light in the Dicke-Bose-Hubbard model Quantum Phase Transitions of Light in the Dicke-Bose-Hubbard model

2007-09-10

arxiv.org/abs/0709.1352v1

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.77.033827

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.

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