Higher order Shapiro steps in ac-driven Josephson junctions

Details Higher order Shapiro steps in ac-driven Josephson junctions Higher order Shapiro steps in ac-driven Josephson junctions

1998-09-02

arxiv.org/abs/patt-sol/9809003v1

Phys. Rev B 59,58 (1999)

Physics

Condensed Matter

4 pages, 3 figures REVTEX

Scientific paper

10.1103/PhysRevB.59.58

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.

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