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Related Experiment Videos

High-efficiency deterministic Josephson vortex ratchet.

M Beck1, E Goldobin, M Neuhaus

  • 1Physikalisches Institut-Experimentalphysik II, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany.

Physical Review Letters
|October 4, 2005
PubMed
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Researchers explored a Josephson vortex ratchet, observing up to 91% efficiency in an annular Josephson junction. They found quantized rectified voltage and chaotic dynamics at high frequencies due to fluxon inertia.

Area of Science:

  • Superconductivity
  • Nonlinear Dynamics
  • Condensed Matter Physics

Background:

  • Josephson junctions exhibit complex dynamics under external driving forces.
  • Asymmetric potentials can lead to directed motion of particles (ratchet effect).
  • Fluxons in Josephson junctions are analogous to particles in physical systems.

Purpose of the Study:

  • To experimentally investigate the Josephson vortex ratchet in an underdamped annular long Josephson junction.
  • To analyze the effect of deterministic driving forces with zero time average on fluxon dynamics.
  • To explore the influence of driving force spectral content on the ratchet effect.

Main Methods:

  • Creation of a highly asymmetric periodic potential using a current injector.
  • Experimental measurement of the ratchet effect under various driving force conditions.

Related Experiment Videos

  • Analysis of rectified voltage, chaos, subharmonic dynamics, and voltage reversal.

    • Main Results:

    • Achieved device efficiency up to 91% in the Josephson vortex ratchet.
    • Observed quantized rectified voltage for monochromatic high-frequency driving forces.
    • Detected chaos, subharmonic dynamics, and voltage reversal at high driving frequencies, attributed to fluxon inertia.

    Conclusions:

    • The Josephson vortex ratchet demonstrates high efficiency in asymmetric periodic potentials.
    • Fluxon inertia plays a crucial role in high-frequency dynamics, leading to complex phenomena like voltage reversal.
    • The study provides insights into controlling and understanding fluxon dynamics in Josephson junctions.