Nonequilibrium quantum phase transitions in the Dicke model

Phys Rev Lett. 2012 Jan 27;108(4):043003. doi: 10.1103/PhysRevLett.108.043003. Epub 2012 Jan 25.

Abstract

We establish a set of nonequilibrium quantum phase transitions in the Dicke model by considering a monochromatic nonadiabatic modulation of the atom-field coupling. For weak driving the system exhibits a set of sidebands which allow the circumvention of the no-go theorem which otherwise forbids the occurrence of superradiant phase transitions. At strong driving we show that the system exhibits a rich multistable structure and exhibits both first- and second-order nonequilibrium quantum phase transitions.