World’s Smallest Transistor

Researchers have built the world's smallest transistor out of a material they say could one day replace silicon. How small is the new transistor? Ten atoms wide and only one atom thick.

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.

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