Thermal depinning of fluxons in discrete Josephson rings

Details Thermal depinning of fluxons in discrete Josephson rings Thermal depinning of fluxons in discrete Josephson rings

2008-06-30

arxiv.org/abs/0806.4828v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.78.174510

We study the thermal depinning of single fluxons in rings made of Josephson junctions. Due to thermal fluctuations a fluxon can be excited from its energy minima and move through the array, causing a voltage across each junction. We find that for the initial depinning, the fluxon behaves as a single particle and follows a Kramers-type escape law. However, under some conditions this single particle description breaks down. At low values of the discreteness parameter and low values of the damping, the depinning rate is larger than the single particle result would suggest. In addition, for some values of the parameters the fluxon can undergo low-voltage diffusion before switching to the high-voltage whirling mode. This type of diffusion is similar to phase diffusion in a single junction, but occurs without frequency-dependent damping. We study the switching to the whirling state as well.

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