Journal
SCIENCE
Volume 312, Issue 5780, Pages 1634-1636Publisher
AMER ASSOC ADVANCEMENT SCIENCE
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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