Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-07-03
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 2 figures
Scientific paper
We calculate the modulation by a magnetic field of the critical current of a long disordered Josephson junction in the diffusive limit, i.e. when the dimensions of the junction are larger that the elastic mean free path, and when the length $L$ is much larger than the width $w$. Due to the averaging of the gauge invariant phase factor over diffusive trajectories, the well-known oscillations of the Fraunhofer pattern are smoothed out and replaced by an exponential decay at large field. The predicted pattern is universal, i.e., it is independent of the disorder strength. We point out an interesting relation with the physics of speckle correlations in optics of turbid media.
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