Phase Sensitive Shot Noise in an Andreev Interferometer

Details Phase Sensitive Shot Noise in an Andreev Interferometer Phase Sensitive Shot Noise in an Andreev Interferometer

2002-08-05

arxiv.org/abs/cond-mat/0208089v1

Phys. Rev. Lett. 90, 066601 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.90.066601

We investigate nonequilibrium noise in a diffusive Andreev interferometer, in which currents emerging from two Normal metal/Superconductor (N-S) interfaces can interfere. We observe a modulation of the shot noise when the phase difference between the two N-S interfaces is varied by a magnetic flux. This is the signature of phase-sensitive fluctuations in the normal metal. The effective charge inferred from the shot noise measurement is close to q_eff=2e but shows phase-dependent deviations from 2e at finite energy, which we interprete as due to pair correlations. Experimental data are in good agreement with theoretical predictions based on an extended Keldysh Green's function approach.

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