No singularities in observables at the phase transition in the Dicke model

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Dicke-Model Phase Transition in the Quantum Motion of a Bose-Einstein Condensate in an Optical Cavity

(2010) D. Nagy et al.   PHYSICAL REVIEW LETTERS

No-go theorem for superradiant quantum phase transitions in cavity QED and counter-example in circuit QED

(2010) Pierre Nataf et al.   Nature Communications

Analytic approximation of the Tavis–Cummings ground state via projected states

(2009) Octavio Castaños et al.   PHYSICA SCRIPTA

Coherent state description of the ground state in the Tavis–Cummings model and its quantum phase transitions

(2009) Octavio Castaños et al.   PHYSICA SCRIPTA

 Exotic quantum phase transitions in a Bose-Einstein condensate coupled to an optical cavity

(2008) Gang Chen et al.   PHYSICAL REVIEW A