Supercurrent switch in graphene pi junctions.
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 the 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.
Department of Physics, Norwegian University of Science and Technology, N-7491 Trondheim, Norway.
Jacob
J
Linder
Takehito
T
Yokoyama
Daniel
D
Huertas-Hernando
Asle
A
Sudbø