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Dissipative currents in superfluid 3He weak links.

J K Viljas1, E V Thuneberg

  • 1Low Temperature Laboratory, Helsinki University of Technology, P.O. Box 2200, FIN-02015 HUT, Finland.

Physical Review Letters
|December 17, 2004
PubMed
Summary

We calculated the current-pressure relation for superfluid 3He-B pinholes. Multiple Andreev reflections theory explains the nonlinear current-pressure dependence and spin wave radiation, matching experimental data.

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Area of Science:

  • Condensed Matter Physics
  • Superfluidity

Background:

  • Superfluid 3He-B exhibits unique quantum phenomena.
  • Understanding current flow through microstructures is crucial for quantum devices.

Purpose of the Study:

  • To calculate the current-pressure relation for pinholes in superfluid 3He-B.
  • To investigate the influence of multiple Andreev reflections and Josephson frequency oscillations on current transport.

Main Methods:

  • Theoretical calculation using the theory of multiple Andreev reflections.
  • Adaptation of models from superconducting weak links.
  • Analysis of texture oscillations at the Josephson frequency.

Main Results:

  • A nonlinear dependence of the direct current (dc) on pressure bias was found.
  • Oscillations of the texture at the Josephson frequency were considered for pinhole arrays.
  • An additional dissipative current at small biases due to spin wave radiation was identified.

Conclusions:

  • The theoretical model successfully explains the observed nonlinear current-pressure relation.
  • Spin wave radiation contributes to dissipation in superfluid 3He-B pinholes.
  • The findings align with experimental measurements of superfluid current transport.

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