Distribution functions and current-current correlations in normal-metal-superconductor heterostructures

被引：50

作者：

Gramespacher, T ^{[1
]}

Büttiker, M

机构：

[1] Univ Geneva, Dept Phys Theor, CH-1211 Geneva 4, Switzerland

[2] Duke Univ, Dept Phys, Durham, NC 27708 USA

来源：

PHYSICAL REVIEW B | 2000年 / 61卷 / 12期

关键词：

D O I：

10.1103/PhysRevB.61.8125

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We introduce electronlike and holelike distribution functions, which determine the currents and the fluctuation spectra of the currents measured at a normal-conductor-superconductor heterostructure. These distribution functions are expressed with the help of newly defined partial densities of states for heterostructures. Voltage measurements using a weakly coupled contact on such a structure show the absence of a contact resistance to the superconducting reservoir and illustrate how the interface to the superconductor acts as an Andreev mirror. We also discuss the current-current correlations measured at two normal contacts and argue that the appearance of positive correlations is a purely mesoscopic effect, which vanishes in the limit of a large number of channels and in the average over an ensemble.

引用

页码：8125 / 8132

页数：8

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