Nonequilibrium quasiparticles and 2e periodicity in single-Cooper-pair transistors -: art. no. 066802

被引：192

作者：

Aumentado, J ^{[1
]}

Keller, MW

Martinis, JM

Devoret, MH

机构：

[1] Natl Inst Stand & Technol, Boulder, CO 80305 USA

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

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.92.066802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have fabricated single-Cooper-pair transistors in which the spatial profile of the superconducting gap energy was controlled by oxygen doping. The profile dramatically affects the switching current vs gate voltage curve of the transistor, changing its period from 1e to 2e. A model based on nonequilibrium quasiparticles in the leads explains our results, including the observation that even devices with a clean 2e period are "poisoned" by small numbers of these quasiparticles.

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页数：4

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