Doubled shot noise in disordered normal-metal–superconductor junctions
- 1 June 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 49 (22) , 16070-16073
- https://doi.org/10.1103/physrevb.49.16070
Abstract
The low-frequency shot-noise power of a normal-metal–superconductor junction is studied for an arbitrary normal region. Through a scattering approach, a formula is derived that 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 2 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.Keywords
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