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Related Experiment Videos

Quantum ratchet effect for vortices.

J B Majer1, J Peguiron, M Grifoni

  • 1Department of Nanoscience, Delft University of Technology, Lorentzweg 1, The Netherlands.

Physical Review Letters
|March 14, 2003
PubMed
Summary
This summary is machine-generated.

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We measured a quantum ratchet effect in Josephson junction arrays. The designed band structure dictates the effect, with specific asymmetric designs preventing rectification at low temperatures.

Area of Science:

  • Condensed Matter Physics
  • Quantum Transport

Background:

  • Josephson junction arrays are solid-state devices enabling the study of quantum phenomena.
  • Vortex dynamics in these arrays can be controlled by designing the potential energy landscape.
  • The quantum ratchet effect is a phenomenon where directed motion arises from asymmetric potentials in quantum systems.

Purpose of the Study:

  • To experimentally investigate the quantum ratchet effect in quasi-one-dimensional Josephson junction arrays.
  • To explore the role of designed band structure in the presence or absence of this effect.
  • To analyze the quantum nature of transport through voltage-current characteristics.

Main Methods:

  • Fabrication of quasi-one-dimensional Josephson junction arrays with designed vortex potential energy shapes.

Related Experiment Videos

  • Measurement of vortex movement and resulting voltage-current characteristics.
  • Analysis of band structure and its influence on rectification and transport properties.

    • Main Results:

    • Observed a quantum ratchet effect for vortices in the Josephson junction array.
    • Demonstrated that designed band structures critically determine the presence of the quantum ratchet effect.
    • Found that asymmetric structures with a single band below the barrier suppress current rectification at low temperatures and bias currents.
    • Identified universal/nonuniversal power-law dependencies in voltage-current characteristics, indicating quantum transport.

    Conclusions:

    • The quantum ratchet effect in Josephson junction arrays is controllable via designed band structures.
    • Specific band structures can prevent rectification, highlighting the importance of potential asymmetry.
    • The observed transport characteristics confirm the quantum nature of the phenomenon.