Researchers have built the world's smallest transistor - one atom thick and 10 atoms wide - out of a material that could one day replace silicon.The transistor, essentially an on/off switch, has been made using graphene, a two-dimensional material first discovered only four years ago.
Graphene is a single layer of graphite, which is found in the humble pencil.
The transistor is the key building block of microchips and the basis for almost all electronics.
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