Controlling Josephson dynamics by strong microwave fields


Chesca, B. and Savel'ev, E. and Rakhmanov, A.L. and Smilde, H.J.H. and Hilgenkamp, H. (2008) Controlling Josephson dynamics by strong microwave fields. Physical Review B: Condensed matter and materials physics, 78 (9). 094505. ISSN 1098-0121

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Abstract:We observe several sharp changes in the slope of the current-voltage characteristics (CVCs) of thin-film ramp-edge Josephson junctions between YBa2Cu3O7−delta 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.
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Copyright:© 2008 American Physical Society
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