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Berry Phase and Fidelity in the Dicke model with $A^{2}$ term
Berry Phase Fidelity Dicke model with $A^{2}$ term
2010/4/8
The instability, so-called the quantum-phase-like transition, in the Dicke model with a rotating-wave approximation for finite $N$ atoms is investigated in terms of the Berry phase and the fidelity. I...