Symmetry breaking and AC-driven dynamics of solitons
Abstract:
We report on the possibility of unidirectional motion of a topological
soliton in a dissipative AC-driven Klein-Gordon equation. This motion is
due to breaking of certain space-time symmetries. It can be achieved by
the proper choice of the potential or the AC force. Tha same symmetry considerations
are applied to the discrete Klein-Gordon equation. We formulate the necessary
symmetry conditions for the AC force and confirm them with the first order
perturbation theory and numerical simulations.