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Noise measurements in quantum dots using charge detection techniques

✍ Scribed by S. Gustavsson; R. Leturcq; T. Ihn; K. Ensslin; D.C. Driscoll; A.C. Gossard

Publisher: Elsevier Science
Year: 2007
Tongue: English
Weight: 337 KB
Volume: 40
Category: Article
ISSN: 1386-9477
DOI: 10.1016/j.physe.2007.05.018

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✦ Synopsis

We have measured the current fluctuations in a quantum dot using a quantum point contact as a charge detector. By determining the distribution function for the charge transferred through the quantum dot, we get access not only to the shot noise but also to higher order moments. The noise in the quantum dot was found to be reduced compared to the single-barrier case. The reduction can be explained by an increase in temporal correlation due to the Coulomb blockade. Furthermore, we have used the time-resolved measurement techniques to investigate degenerate states in the quantum dot.

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