The recent experimental discovery of graphene [1, 2], filling the gap between quasi 1-dimensional (1-D) nanotubes and 3-D graphite makes truly 2-D solid state systems accessible. Both graphene and carbon nanotubes exhibit unique electronic properties which make these materials promising candidates for future high mobility nanoelectronics and potential extensions to downscaling state-of-the-art silicon technology [3]. In this context, graphene and carbon nanotubes are both interes...