Tunable \(\varphi\) Josephson Junction ratchet

Tunable \(\varphi\) Josephson Junction ratchet

We demonstrate experimentally the operation of a deterministic Josephson ratchet with tunable asymmetry. The ratchet is based on a \(\varphi\) Josephson junction with a ferromagnetic barrier operating in the underdamped regime. The system is probed also under the action of an additional dc current,...

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Veröffentlicht in:arXiv.org 2016-07
Hauptverfasser: Menditto, R, Sickinger, H, Weides, M, Kohlstedt, H, Koelle, D, Kleiner, R, Goldobin, E
Format: Artikel
Sprache:eng
Schlagworte:
Ferromagnetism
Josephson junctions
Power efficiency
Quantum theory
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Zusammenfassung:We demonstrate experimentally the operation of a deterministic Josephson ratchet with tunable asymmetry. The ratchet is based on a \(\varphi\) 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 \(\varphi\) Josephson junction ratchet.
ISSN:2331-8422
DOI:10.48550/arxiv.1607.07717