Shot noise and coherent multiple charge transfer in superconducting quantum point-contacts

A. Levy Yeyati; A. Martin-Rodero; J.C. Cuevas

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Shot noise and coherent multiple charge transfer in superconducting quantum point-contacts

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arxiv cond-mat/9812175 v1 pith:ZK3W4TM7 submitted 1998-12-10 cond-mat.supr-con cond-mat.mes-hall

J.C. Cuevas , A. Martin-Rodero , A. Levy Yeyati This is my paper

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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.

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