ABSTRACT
Graphene is a two-dimensional crystalline solid composed of a planar single-atom-thick hexagonal arrangement of carbon atoms [1,2]. Graphene has a conical electronic band structure with zero band gap. The electrons in graphene behave as massless Dirac fermions with ballistic transport lengths of hundreds of nanometers even at room temperature. Its electron mobility is weakly dependent on temperature and is still limited by impurity scattering at room temperature.
