Jens Baringhaus, Christoph Tegenkamp, Frederik Edler, Ming Ruan, Edward Conrad, Claire Berger, Walt A. de Heer
Graphene-based high-performance nanoelectronics motivates most graphene research. However conventionally produced graphene nanostructures and ribbons in particular are highly resistive and therefore ineffective. We have produced arrays of thousands of ~ 40 nm wide graphene nanoribbons grown on thermally annealed steps etched in single crystal silicon carbide. Their resistances are consistently close to the resistance quantum, essentially temperature independent and depend only slightly on ribbon length consistent with ballistic transport. Resistivities are up to 50 times smaller than copper, and more than 1000 times smaller than lithographically patterned graphene ribbons at room temperature. A non-linear resistance increase observed for ribbons longer than 15 micrometers, suggests room temperature phase coherent transport. Ballistic transport is confirmed in cryogenic transport measurements on electrostatically gated graphene ribbons. Our unprecedented observations are consistent with polarized transport in an edge state. Our ribbons are ideal for nanographene device interconnects and may be applied in non-conventional electronics.
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http://arxiv.org/abs/1301.5354
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