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Related Experiment Videos

Phase sensitive shot noise in an Andreev interferometer.

B Reulet1, A A Kozhevnikov, D E Prober

  • 1Departments of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520-8284, USA.

Physical Review Letters
|March 14, 2003
PubMed
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We observed phase-sensitive fluctuations in normal metal/superconductor (N-S) interfaces by measuring shot noise in an Andreev interferometer. The effective charge showed phase-dependent deviations, indicating pair correlations.

Area of Science:

  • Condensed Matter Physics
  • Quantum Transport

Background:

  • Andreev interferometry involves quantum interference of currents at normal metal/superconductor (N-S) interfaces.
  • Nonequilibrium noise measurements probe fundamental quantum transport phenomena.

Purpose of the Study:

  • To investigate nonequilibrium noise in a diffusive Andreev interferometer.
  • To explore phase-sensitive fluctuations and effective charge in N-S interfaces.

Main Methods:

  • Utilizing a diffusive Andreev interferometer with two N-S interfaces.
  • Modulating the phase difference between N-S interfaces using magnetic flux.
  • Measuring shot noise to infer effective charge.

Main Results:

  • Observed modulation of shot noise with varying phase difference.

Related Experiment Videos

  • Identified phase-sensitive fluctuations in the normal metal.
  • Inferred effective charge close to 2e, with finite-energy, phase-dependent deviations.

    • Conclusions:

    • Phase-sensitive fluctuations are a signature of quantum interference in N-S systems.
    • Deviations in effective charge suggest the influence of pair correlations.
    • Experimental results align with theoretical predictions from extended Keldysh Green's function formalism.