Phase sensitive shot noise in an Andreev interferometer

被引：30

作者：

Reulet, B ^{[1
]}

Kozhevnikov, AA

Prober, DE

Belzig, W

Nazarov, YV

机构：

[1] Yale Univ, Dept Appl Phys, New Haven, CT 06520 USA

[2] Yale Univ, Dept Phys, New Haven, CT 06520 USA

[3] Univ Paris 11, Phys Solides Lab, CNRS, F-91405 Orsay, France

[4] Univ Basel, Dept Phys & Astron, CH-4056 Basel, Switzerland

[5] Delft Univ Technol, Dept Appl Phys, NL-2628 CJ Delft, Netherlands

[6] Delft Univ Technol, Delft Inst Microelect & Submicron Technol, NL-2628 CJ Delft, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 06期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.90.066601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate nonequilibrium noise in a diffusive Andreev interferometer, in which currents emerging from two normal metal/superconductor (N-S) interfaces can interfere. We observe a modulation of the shot noise when the phase difference between the two N-S interfaces is varied by a magnetic flux. This is the signature of phase-sensitive fluctuations in the normal metal. The effective charge inferred from the shot noise measurement is close to q(eff) = 2e but shows phase-dependent deviations from 2e at finite energy, which we interpret as being due to pair correlations. Experimental data are in good agreement with predictions based on an extended Keldysh Green's function approach.

引用

页数：4

共 28 条

[1] EFFECTS OF ELECTRON-ELECTRON COLLISIONS WITH SMALL ENERGY TRANSFERS ON QUANTUM LOCALIZATION [J].