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Science 16 June 2006:
Vol. 312. no. 5780, pp. 1634 - 1636
DOI: 10.1126/science.1126788
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Reports

Bidirectional Counting of Single Electrons

Toshimasa Fujisawa,1,2* Toshiaki Hayashi,1 Ritsuya Tomita,1,2 Yoshiro Hirayama1,3,4

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.

1 NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi 243-0198, Japan.
2 Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan.
3 Solution Oriented Research for Science and Technology (SORST), Japan Science and Technology Agency, 4-1-8 Honmachi, Kawaguchi 331-0012, Japan.
4 Department of Physics, Tohoku University, Sendai, Miyagi 980-8578, Japan.

* To whom correspondence should be addressed. E-mail: fujisawa{at}nttbrl.jp

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Universal oscillations in counting statistics.
C. Flindt, C. Fricke, F. Hohls, T. Novotny, K. Netocny, T. Brandes, and R. J. Haug (2009)
PNAS 106, 10116-10119
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