CHESCA, B. ... et al, 2008. Controlling Josephson dynamics by strong microwave fields. Physical Review B, 78 (9), 6pp.
We observe several sharp changes in the slope of the current-voltage characteristics CVCs of thin-film
ramp-edge Josephson junctions between YBa2Cu3O7− and Nb when applying strong microwave fields. Such
behavior indicates an intriguing Josephson dynamics associated with the switching from a parametric excitation
regime induced by the magnetic field of the microwave via oscillations of the Josephson critical current to
an ac-current-excitation regime triggered by the electric field of the microwave. We propose a model, which
describes the observed features on the CVC in terms of microwave-induced multiple switching between
running and locked solutions of sine-Gordon equation.