In diverse superradiant models the normal phase occupies the origin and the transition occurs only once along radial coupling vectors under mean-field theory at finite temperature, permitting concise boundary calculations.
The stability condition of the system is 1 − 4J/ω − U/ω > 0, which will be discussed later
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General phase diagram features of superradiant phase transitions
In diverse superradiant models the normal phase occupies the origin and the transition occurs only once along radial coupling vectors under mean-field theory at finite temperature, permitting concise boundary calculations.