Dynamic transitions and resonances in Josephson-junction arrays under   oscillating magnetic fields
  We investigate dynamic transitions and stochastic resonance phenomena in two-dimensional fully frustrated Josephson-junction arrays driven by staggered oscillating magnetic fields. As the temperature is lowered, the dynamic order parameter, defined to be the average staggered magnetization, is observed to acquire nonzero values. The resulting transition is found to belong to the same universality as the equilibrium Z_2 transition for small driving amplitudes while large driving fields appear to induce deviation from the universality class. The transition is also manifested by the stochastic resonance peak of the signal-to-noise ratio, which develops above the transition temperature. 
Gun Sang Jeon, Hyun Jin Kim, M.Y. Choi, Beom Jun Kim, Petter Minnhagen