Radiation from Flux Flow in Josephson Junction Structures

Radiation linewidth of a long Josephson junction in the flux-flow regime.

Theoretical model for the radiation linewidth in a multi-fluxon state of a long Josephson junction is presented. Starting from the perturbed sine-Gordon model with the temperature dependent noise term, we develop a collective coordinate approach which allows to calculate the finite radiation linewidth due to excitation of the internal degrees of freedom in the moving fluxon chain. At low fluxon...

Josephson flux - flow oscillator

A pr 1 99 6 Vortex dynamics in disordered Josephson junction arrays : from plastic flow to flux flow ∗

We study the dynamics of Josephson junction arrays with posi-tional disorder and driven by an external current. We consider weak magnetic fields, corresponding to a frustration f = n + 1/25 with n integer. We find that above the critical current i c there is a plastic flow of vortices, where most of the vortices are pinned and only a few vortices flow through channels. This dynamical regime is ...

On the Chaotic Flux Dynamics in a Long Josephson Junction

Flux dynamics in an annular long Josephson junction is studied. Three main topics are covered. The first is chaotic flux dynamics and its prediction via Melnikov integrals. It turns out that DC current bias cannot induce chaotic flux dynamics, while AC current bias can. The existence of a common root to the Melnikov integrals is a necessary condition for the existence of chaotic flux dynamics. ...

Giant Shapiro resonances in a flux driven Josephson junction necklace

We present a detailed study of the dynamic response of a ring of N equally spaced Josephson junctions to a time-periodic external flux, including screening current effects. The dynamics are described by the resistively shunted Josephson junction model, appropriate for proximity effect junctions, and we include Faraday’s law for the flux. We find that the time-averaged I−V characteristics show n...