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Accurate measurement of currents generated by single electrons transported in a one-dimensional channel

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2 Author(s)
Janssen, T.J.B.M. ; Centre for Electromagnetic & Time Metrol., Nat. Phys. Lab., Teddington, UK ; Hartland, A.

The acoustoelectric current generated by the transport of single electrons using surface acoustic waves through a one-dimensional channel offers the possibility of realising a quantum standard of current based on the electronic charge e. At NPL a measurement system using a commercial electrometer has been developed for investigating the flatness and accuracy of the constant current plateaux with an uncertainty of 15 fA. Also a new instrument, based on a cryogenic current comparator (CCC), has been developed with which it is expected that a relative accuracy of 1 fA/nA can be achieved. The authors present preliminary measurements of the quantised current using the electrometer and an experimental arrangement for resolving the `metrological triangle' using the CCC

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Science, Measurement and Technology, IEE Proceedings -  (Volume:147 ,  Issue: 4 )