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Tunable φ Josephson junction ratchet.

R Menditto1, H Sickinger1, M Weides2

  • 1Physikalisches Institut and Center for Quantum Science in LISA+, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany.

Physical Review. E
|November 15, 2016
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Summary

We show a Josephson ratchet that can operate against a counterforce, generating usable power. This tunable asymmetry device, based on a Josephson junction, demonstrates potential for energy harvesting applications.

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Area of Science:

  • Quantum electronics
  • Condensed matter physics

Background:

  • Josephson junctions are key components in quantum electronic devices.
  • Understanding ratchet mechanics is crucial for energy harvesting and directed transport.

Purpose of the Study:

  • To experimentally demonstrate a deterministic Josephson ratchet with tunable asymmetry.
  • To investigate the ratchet's operation under an opposing DC current.
  • To estimate the efficiency of the Josephson junction ratchet.

Main Methods:

  • Fabrication and operation of a $\phi$ Josephson junction with a ferromagnetic barrier.
  • Utilizing the underdamped regime for ratchet dynamics.
  • Applying an external DC current as a counterforce.

Main Results:

  • The Josephson ratchet operates deterministically with tunable asymmetry.
  • The ratchet successfully functions against an applied counterforce, producing net output power.
  • The efficiency of the $\phi$ Josephson junction ratchet was estimated.

Conclusions:

  • The demonstrated Josephson ratchet offers a controllable system for directed transport.
  • The ability to generate power against a counterforce highlights potential applications in quantum energy harvesting.
  • Further research can optimize the efficiency and explore other configurations of Josephson ratchets.