Quantum criticality in a generalized Dicke model

Details Quantum criticality in a generalized Dicke model Quantum criticality in a generalized Dicke model

2006-04-13

arxiv.org/abs/quant-ph/0604097v2

Phys. Rev. A 74, 023815 (2006)

Physics

Quantum Physics

6 pages, 3 figures

Scientific paper

10.1103/PhysRevA.74.023815

We employ a generalized Dicke model to study theoretically the quantum criticality of an extended two-level atomic ensemble interacting with a single-mode quantized light field. Effective Hamiltonians are derived and diagonalized to investigate numerically their eigenfrequencies for different quantum phases in the system. Based on the analysis of the eigenfrequencies, an intriguing quantum-phase transition from a normal phase to a superradiant phase is revealed clearly, which is quite different from that observed with a standard Dicke model.

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