A supercurrent switch in graphene $\pi$-junctions

Abstract

We study the supercurrent in a superconductor/ferromagnet/superconductor graphene junction. In contrast to its metallic counterpart, the oscillating critical current in our setup decays only weakly upon increasing exchange field and junction width. We find an unusually large residual value of the supercurrent at the oscillatory cusps due to a strong deviation from a sinusoidal current-phase relationship. Our findings suggest a very efficient device for dissipationless supercurrent switching.

4 pages, 3 figures. High-quality figures available in published version. Accepted for publication in Phys. Rev. Lett

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• The role of interface transparency and spin-dependent scattering in diffusive ferromagnet/superconductor heterostructures
• Nonsinusoidal current-phase relation in strongly ferromagnetic and moderately disordered SFS junctions
• $\pi$-junction qubit in monolayer graphene