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Related Experiment Videos

Whispering vortices

Wallraff1, Ustinov, Kurin

  • 1Physikalisches Institut III, Universitat Erlangen-Nurnberg, D-91058 Erlangen, Germany.

Physical Review Letters
|October 4, 2000
PubMed
Summary

Researchers observed novel resonances in Josephson junctions when a vortex moved at relativistic speeds. This interaction excited electromagnetic modes, creating new patterns on the current-voltage characteristic.

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Area of Science:

  • Superconducting electronics
  • Electromagnetism
  • Vortex dynamics

Background:

  • Josephson junctions are key components in superconducting electronics.
  • Understanding vortex dynamics is crucial for advanced superconducting devices.
  • Whispering-gallery modes are electromagnetic resonances confined within structures.

Purpose of the Study:

  • To investigate the excitation of whispering-gallery electromagnetic modes.
  • To study the behavior of vortices moving in annular Josephson junctions.
  • To analyze the resulting current-voltage characteristics.

Main Methods:

  • Experimental observation of electromagnetic mode excitation.
  • Utilizing annular Josephson junctions.
  • Applying relativistic vortex velocities.
  • Analysis using the two-dimensional sine-Gordon model.

Main Results:

  • Successful excitation of whispering-gallery modes by a moving vortex.
  • Observation of novel resonances on the current-voltage characteristic at relativistic speeds.
  • Experimental data align well with theoretical predictions.

Conclusions:

  • Relativistic vortex motion in Josephson junctions can excite specific electromagnetic modes.
  • This interaction leads to observable novel resonances.
  • The two-dimensional sine-Gordon model accurately describes the observed phenomena.

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