Zero Field Steps in Josephson Junctions

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Abstract
The fluxon-antifluxon array is shown to play an important role to produce the zero-field (ZFS) by modulating the resonant interaction between ac Josephson current-density waves and cavity waves. Good agreements between the theory and the experiments are found. It is shown that large current steps occur at even-order voltages, and their amplitudes decrease with increasing voltage. Furthermore, the respective origins of a cutoff voltage and hysteresis phenomena are explained.