  We propose a novel ultrafast electronic switching device based on
dual-graphene electron waveguides, in analogy to the optical dual-channel
waveguide device. The design utilizes the principle of coherent quantum
mechanical tunneling of Rabi oscillations between the two graphene electron
waveguides. Based on a modified coupled mode theory, we construct a theoretical
model to analyse the device characteristics, and predict that the swtiching
speed is faster than 1 ps. Due to the long mean free path of electrons in
graphene at room temperature, the proposed design avoids the limitation of low
temperature operation required in the normal semiconductor quantum-well
structure. The layout of the our design is similar to that of a standard CMOS
transistor that should be readily fabricated with current state-of-art
nanotechnology.
