Observation of Andreev reflection enhanced shot noise

被引：102

作者：

Dieleman, P

Bukkems, HG

Klapwijk, TM

Schicke, M

Gundlach, KH

机构：

[1] UNIV GRONINGEN, CTR MAT SCI, NL-9747 AG GRONINGEN, NETHERLANDS

[2] INST RADIO ASTRON MILLIMETR, F-38406 ST MARTIN DHERES, FRANCE

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 79卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.79.3486

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have experimentally investigated the quasiparticle shot noise in NbN/MgO/NbN superconductor-insulator-superconductor tunnel junctions. The observed shot noise is significantly larger than theoretically expected. We attribute this to the occurrence of multiple Andreev reflection processes in pinholes present in the MgO barrier. This mechanism causes the current to flow in large charge quanta (Andreev clusters), with a voltage dependent average value of m approximate to 1 + 2 Delta/eV times the electron charge. Because of this charge enhancement effect, the shot noise is increased by the factor m.

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页码：3486 / 3489

页数：4

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