Researchers from Japan's AIST and NIMS institues developed a new low power graphene transistor design and produced a working prototype. The new transistor is based on a new operation principle, where two electrodes and two top gates were arranged on the graphene, and crystal defects were introduced by irradiating a helium ion beam on the graphene between the top gates.
In this transistor charge movement can be controlled efficiently by applying an independent voltage to the two top gates. Transistor polarity can be reversed by electrical control. That's the first transistor that can do this.