Phase operator and phase transition in a classical Dicke model

We study the thermodynamical properties of a Dicke model with classical spins. As in the quantum case, the model exhibits a phase transition associated with the spontaneous breaking of the gauge symmetry. We calculate the thermodynamical equilibrium photon state in a relatively simple way both at an...

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Bibliographic Details
Published inAnnals of physics Vol. 107; no. 1; pp. 168 - 187
Main Authors Provost, J.P, Rocca, F, Vallee, G
Format Journal Article
LanguageEnglish
Published Elsevier Inc 01.01.1977
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Summary:We study the thermodynamical properties of a Dicke model with classical spins. As in the quantum case, the model exhibits a phase transition associated with the spontaneous breaking of the gauge symmetry. We calculate the thermodynamical equilibrium photon state in a relatively simple way both at any temperature and in the presence of an external field. We emphasize that the phase transition is conneccted with the existence of an observable phase operator below the critical temperature.
ISSN:0003-4916
1096-035X
DOI:10.1016/0003-4916(77)90208-1