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

被引：92

作者：

Cuevas, JC ^{[1
]}

Martín-Rodero, A ^{[1
]}

Yeyati, AL ^{[1
]}

机构：

[1] Univ Autonoma Madrid, Dept Fis Teor Mat Condensada CV, E-28049 Madrid, Spain

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 82卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.82.4086

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 steplike 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.

引用

页码：4086 / 4089

页数：4

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