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.

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• Scaling Theory of Quantum Ratchet
• YBa${}_2$Cu${}_3$O${}_7$ Josephson diode operating as a high-efficiency ratchet
• Josephson Diode Effect from Nonequilibrium Current in a Superconducting Interferometer
• Fractional positional jumps in stochastic systems with tilted periodic double-well potentials
• Effect of 2${}^{\text{nd}}$ harmonic current--phase relation on a behavior of a Josephson Traveling Wave Parametric Amplifier