Bidirectional Counting of Single Electrons

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Science  16 Jun 2006:
Vol. 312, Issue 5780, pp. 1634-1636
DOI: 10.1126/science.1126788

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A bidirectional single-electron counting device is demonstrated. Individual electrons flowing in forward and reverse directions through a double quantum dot are detected with a quantum point contact acting as a charge sensor. A comprehensive statistical analysis in the frequency and time domains and of higher order moments of noise reveals antibunching correlation in single-electron transport through the device itself. The device can also be used to investigate current flow in the attoampere range, which cannot be measured by existing current meters.

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