A supercurrent switch in graphene $\pi$-junctions
Jacob Linder, Takehito Yokoyama, Daniel Huertas-Hernando, and Asle, Sudb\o
TL;DR
This paper investigates a graphene-based superconductor/ferromagnet/superconductor junction, revealing weak decay of supercurrent with exchange field and junction width, and demonstrating potential for efficient dissipationless switching.
Contribution
It introduces a novel graphene $$-junction supercurrent switch with unique decay and current-phase characteristics compared to metallic counterparts.
Findings
Supercurrent decays weakly with increasing exchange field and junction width.
Large residual supercurrent at oscillatory cusps due to non-sinusoidal current-phase relation.
Potential for highly efficient dissipationless supercurrent switching.
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.
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