Tunable $\varphi$ Josephson Junction ratchet
R. Menditto, H. Sickinger, M. Weides, H. Kohlstedt, D. Koelle, R., Kleiner, and E. Goldobin
TL;DR
This paper demonstrates a tunable Josephson ratchet based on a $\
Contribution
It introduces a $\
Findings
The ratchet operates with tunable asymmetry.
It can produce output power against a counter force.
Efficiency of the Josephson ratchet is estimated.
Abstract
We demonstrate experimentally the operation of a deterministic Josephson ratchet with tunable asymmetry. The ratchet is based on a 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 Josephson junction ratchet.
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