Supercurrent noise in quantum point contacts

被引：98
|
作者：
Averin, D
Imam, HT
机构：
[1] Department of Physics, State University of New York at Stony Brook, Stony Brook, NY
来源：
PHYSICAL REVIEW LETTERS | 1996年 / 76卷 / 20期
关键词：
D O I：
10.1103/PhysRevLett.76.3814
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Spectral density of current fluctuations in a short ballistic superconducting quantum point contact is calculated for arbitrary bias voltages V. Contrary to a commonly held view that the supercurrent flow in Josephson junctions is a coherent process without fluctuations, we find extremely large current noise that is caused by the supercurrent coherence. At finite voltages, this noise can be qualitatively understood as the shot noise of the large charge quanta of magnitude 2 Delta/V equal to the charge transferred through the contact during one period of the Josephson oscillations.
引用
收藏
页码：3814 / 3817
页数：4
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