Dicke model

TheDicke modelis a fundamental model of, which describes the interaction betweenand. In the Dicke model, thelightcomponent is described as a single quantum mode, while thematteris described as a set of. When the coupling between the light and matter crosses a critical value, the Dicke model shows a mean-fieldto a. This transition belongs to theand was realized experimentally inexperiments. Although the superradiant transition bears some analogy with theinstability, these two transitions belong to different universality classes.