Tunable $\phi$ Josephson Junction ratchet

Abstract

We demonstrate experimentally the operation of a deterministic Josephson ratchet with tunable asymmetry. The ratchet is based on a $\phi$ Josephson junction with a ferromagnetic barrier operating in the underdamped regime. The system is probed also under the action of an additional dc current, which acts as a counter force trying to stop the ratchet. Under these conditions the ratchet works against the counter force, thus producing a non-zero output power. Finally, we estimate the efficiency of the $\phi$ Josephson junction ratchet.

References in corpus (10)

• Artificial Brownian motors: Controlling transport on the nanoscale
• Josephson junctions with negative second harmonic in the current-phase relation: properties of novel varphi-junctions
• Experimental evidence of a ϕ Josephson junction
• High efficiency deterministic Josephson Vortex Ratchet
• Brownian motors in micro-scale domain: Enhancement of efficiency by noise
• Static and dynamic properties of 0, pi, and 0-pi ferromagnetic tunnel Josephson Junctions
• Josephson junction ratchet: effects of finite capacitances
• Low-T_c Josephson junctions with tailored barrier
• Critical current diffraction pattern of SIFS Josephson junctions with step-like F-layer
• Model $I$--$V$ curves and figures of merit of underdamped deterministic Josephson ratchets