Electronic Transport in Graphene Nanoribbons in the Presence of Substrate Surface Corrugation
نویسندگان
چکیده
Graphene is a two-dimensional material which has attracted the attention of many scientists over the past few years. To use graphene for electronic applications it should be placed on a substrate. The surface of any substrate has always a degree of corrugation. Substrate surface corrugation affects the surface morphology which in turn modulates the electronic properties of devices placed on such substrates. In this work the role of surface corrugation parameters on the electronic properties of armchair graphene nanoribbons (AGNRs) is studied, employing the non-equilibrium green’s function formalism along with a tight-binding description of the electronic bandstructure. The mean free path as functions of the geometrical and corrugation parameters is extracted and discussed. Surface corrugation affects the bonding lengths between carbon atoms which in turn modulates the hopping parameters [1]. Pereira and co-workers used a rate of decay dtij/dl = −6.4eV/Å and proposed an exponential dependence of the hopping parameter on the bonding length [2, 3]:
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