Journal
APPLIED PHYSICS LETTERS
Volume 85, Issue 19, Pages 4394-4396Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1815041
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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.
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