Quasi-one-dimensional ballistic ring in crossed RF electric fields

The electron dynamics in a quasi-one-dimensional ballistic ring that is subjected to two rf electric fields that have mutually orthogonal polarizations and lie in the plane of the ring is considered. The mean dipole moment and the ring radiation intensity are calculated. The condition for spontaneous symmetry breaking, as a result of which the dipole moment of the system acquires a constant component, is found.