Higher order Shapiro steps in ac-driven Josephson junctions

@inproceedings{Rasmussen1998HigherOS,
  title={Higher order Shapiro steps in ac-driven Josephson junctions},
  author={Kim O . Rasmussen and V. Zharnitsky and Igor Mitkov and Niels Gronbech-Jensen},
  year={1998}
}
  • Kim O . Rasmussen, V. Zharnitsky, +1 author Niels Gronbech-Jensen
  • Published 1998
  • Physics
  • We demonstrate that the well known phase-locking mechanism leading to Shapiro steps in ac-driven Josephson junctions is always accompanied by a higher order phase-locking mechanism similar to that of the parametrically driven pendulum. This effect, resulting in a $\pi$-periodic effective potential for the phase, manifests itself clearly in the parameter regions where the usual Shapiro steps are expected to vanish.