Shot noise and coherent multiple charge transfer in superconducting quantum point-contacts
arXiv:cond-mat/9812175 · doi:10.1103/PhysRevLett.82.4086
Abstract
We analyze the shot noise in a voltage biased superconducting quantum point-contact. Results are presented for the single channel case with arbitrary transmission. In the limit of very low transmission it is found that the effective charge, defined from the noise-current ratio, exhibits a step-like behavior as a function of voltage with well defined plateaus at integer values of the electronic charge. This multiple charge corresponds to the transmitted charge in a Multiple Andreev Reflection (MAR) process. This effect gradually disappears for increasing transmission due to interference between different MAR processes.
RevTex, 10 pages, 3 eps figures. Submitted to PRL
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