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Related Experiment Videos

Full current statistics in diffusive normal-superconductor structures.

W Belzig1, Y V Nazarov

  • 1Department of Applied Physics and Delft Institute of Microelectronics and Submicrontechnology, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.

Physical Review Letters
|August 11, 2001
PubMed
Summary
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Superconductors enhance charge transfer fluctuations in normal conductors. This proximity effect boosts current noise near the Thouless energy, aligning with experimental findings.

Area of Science:

  • Condensed Matter Physics
  • Quantum Transport

Background:

  • Understanding charge transport in normal diffusive conductors interfaced with superconductors is crucial.
  • The Keldysh Green's function method is a powerful tool for analyzing quantum phenomena.

Purpose of the Study:

  • To investigate charge transfer statistics in normal conductors coupled to superconductors.
  • To analyze the impact of the proximity effect on current fluctuations and noise.

Main Methods:

  • Utilizing an extension of the Keldysh Green's function method.
  • Calculating the full distribution of charge transfers across various temperatures and voltages.

Main Results:

  • Demonstrated enhancement of equilibrium current fluctuations in the non-Gaussian regime due to the superconductor.

Related Experiment Videos

  • Predicted enhanced nonequilibrium current noise at temperatures and voltages near the Thouless energy (E(Th) = D/L^2).

    • Conclusions:

    • The proximity effect significantly influences current statistics in normal diffusive conductors.
    • The theoretical model accurately reproduces experimental observations, validating the approach.