Bidirectional counting of single electrons.
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.
Fujisawa
Toshimasa
T
NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi 243-0198, Japan. fujisawa@nttbrl.jp
Hayashi
Toshiaki
T
Tomita
Ritsuya
R
Hirayama
Yoshiro
Y