Doubled Shot Noise In Disordered Normal-Metal-Superconductor Junctions

Details Doubled Shot Noise In Disordered Normal-Metal-Superconductor Junctions Doubled Shot Noise In Disordered Normal-Metal-Superconductor Junctions

1994-03-14

arxiv.org/abs/cond-mat/9403050v1

Phys. Rev. B 49, 16070 (1994)

Physics

Condensed Matter

4 pages, RevTeX v3.0, including 1 figure, Submitted to Physical Review B

Scientific paper

10.1103/PhysRevB.49.16070

The low-frequency shot-noise power of a normal-metal-superconductor junction is studied for arbitrary normal region. Through a scattering approach, a formula is derived which expresses the shot-noise power in terms of the transmission eigenvalues of the normal region. The noise power divided by the current is enhanced by a factor two with respect to its normal-state value, due to Cooper-pair transport in the superconductor. For a disordered normal region, it is still smaller than the Poisson noise, as a consequence of noiseless open scattering channels.

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