Magnetic interference pattern in planar SNS Josephson junctions

Abstract

We study the Josephson current through a ballistic normal metal layer of thickness $D$ on which two superconducting electrodes are deposited within a distance $L$ of each other. In the presence of an ({\it in-layer}) magnetic field we find that the oscillations of the critical current $I_c(\Phi )$ with the magnetic flux $\Phi$ are significantly different from an ordinary magnetic interference pattern. Depending on the ratio $L/D$ and temperature, $I_c(\Phi )$-oscillations can have a period smaller than flux quantum ${\Phi }_0$, nonzero minima and damping rate much smaller than $1/\Phi$. Similar anomalous magnetic interference pattern was recently observed experimentally.

6 pages, 4 figures, Accepted by Phys. Rev. B

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• Edge effects in the magnetic interference pattern of a ballistic SNS junction
• Evidence of Josephson coupling in a few-layer black phosphorus planar Josephson junction
• Magnetic interference patterns in long disordered Josephson junctions
• Magnetic interference patterns in superconducting junctions: Effects of anharmonic current-phase relations