Wednesday, December 19, 2007

Ampere Could Be Defined One Electron At A Time

This is another very clever technique and experiment.

The Ampere unit might possibly be defined more accurately using a single-electron transistor.

The current flowing through the device is simply the number of electrons that tunnel per gate cycle multiplied by the charge of the electron and the frequency of the gate voltage. The gate frequency and number of electrons per cycle can be determined and the charge on the electron is fixed – which means that the device is a very precise source of current.

The team believe that the device could form the basis of a "metrological current pump", which could be used to define the ampere from the fact that

Very nice!


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