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

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

2004-07-06

arxiv.org/abs/cond-mat/0407121v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 3 figures, submitted

Scientific paper

10.1063/1.1815041

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 an IV-convertor at room temperature. We can resolve tunnel events separated by only 8 $\mu$s, limited by noise from the IV-convertor. Shot noise in the QPC sets a 25 ns lower bound on the accessible timescales.

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