Summary: NEST Scientific Report 2007-200947
Electronic states and quantum transport in graphene ribbons
raphene is a single atom thick sheet of carbon. For almost half century after
the pioneering paper of Wallace, strictly two dimensional graphite was but a
beautiful exercise for students of theoretical solid state physics and chemistry.
Only recently high quality and stable under ambient conditions two dimensional carbon
sheets have been isolated, and the potential of graphene-based electronics on the micro-
and nano-metric scale has further magnified the interest toward this material. Graphene
ribbons are infinitely extended in one direction and have two typical terminations in the
orthogonal one: the zigzag and the armchair terminations.
By means of the tight binding model for the description of the electronic states and the
nonequilibrium Keldysh Greenís function for quantum transport, we studied the electronic
structure and current profiles of graphene ribbons. We show that charge manipulation
in the engineering of graphene is conceptually possible by external gates and magnetic
Graphene, neutral or controlled by
external voltages, can be considered as a
reservoir of massless relativistic particles.
The peculiar relativistic-like dynamics of