Real-time detection of single-electron tunneling using a quantum point contact

被引：156

作者：

Vandersypen, LMK

Elzerman, JM

Schouten, RN

van Beveren, LHW

Hanson, R

Kouwenhoven, LP

机构：

[1] Delft Univ Technol, Kavli Inst NanoSci, NL-2628 CJ Delft, Netherlands

[2] Delft Univ Technol, ERATO, Mesoscop Correlat Project, NL-2628 CJ Delft, Netherlands

来源：

APPLIED PHYSICS LETTERS | 2004年 / 85卷 / 19期

关键词：

D O I：

10.1063/1.1815041

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We observe individual tunnel events of a single electron between a quantum dot and a reservoir, using a nearby quantum point contact (QPC) as a charge meter. The QPC is capacitively coupled to the dot, and the QPC conductance changes by about 1% if the number of electrons on the dot changes by one. The QPC is voltage biased and the current is monitored with a current-voltage (I-V) convertor at room temperature. We can resolve tunnel events separated by only 8 mus, limited by noise from the I-V convertor. Shot noise in the QPC sets a 25 ns lower bound on the accessible timescales. (C) 2004 American Institute of Physics.

引用

页码：4394 / 4396

页数：3

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