Graphene nanostructures for device applications

After an introduction that explains why graphene is in general considered to be promising for electronic applications since a few years, we will discuss several of our own new findings on graphene field-effect transistors. In particular, this article makes three points: 1) The material itself - graphene - offers intrinsic advantages due to reduced scattering in low-dimensional structures. 2) The particular energy dispersion of graphene is a key enabler for operation in a new regime called - the quantum capacitance limit. 3) Scaling of graphene devices is not following the classical, diffusive theory. In detail, we present a simple argument why graphene nanostructures exhibit an intrinsic advantage when considering the gate delay in three-terminal device structures and explain why the possibility to operate in the quantum capacitance C_q limit provides additional benefits. We show experimental data on the energy dependence of C_q that support our previous statements and show first experimental evidence that scaling of the off-state in graphene transistors follows percolation theory rather than conventional diffusive transport equations.