Formulation of 2D Graphene Deformation Based on Chiral-Tube Base Vectors
Figure 6
The () nanotube naming scheme can be thought of as a vector (C h) in an infinite graphene sheet that describes how to “roll up” the graphene sheet to make the nanotube. T denotes the tube axis, and a 1 and a 2 are the unit vectors of graphene in real space. http://en.wikipedia.org/wiki/Carbon_nanotube.
