# Universal critical behavior in the Dicke model

@article{Castaos2012UniversalCB, title={Universal critical behavior in the Dicke model}, author={Octavio Casta{\~n}os and Eduardo Nahmad-Achar and Ram'on L'opez-Pena and Jorge G. Hirsch}, journal={Physical Review A}, year={2012}, volume={86}, pages={023814} }

The critical value of the atom-field coupling strength for a finite number of atoms is deter- mined by means of both, semiclassical and exact solutions. In the semiclassical approach we use a variational procedure with coherent and symmetry-adapted states, while for the exact quantum solution the concept of fidelity is employed. These procedures allow for the determination of the phase transitions in the model, and coincide in the thermodynamic limit. For the three cases men- tioned above…

## 15 Citations

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