What does carbon nanotubes (5,5) in (5,5) mean?
You can imagine will find a layer of carbon atoms on the plane (5,5) points, grabbed (5,5) and (0,0), the whole plane to roll the overlap is not only two tubular carbon nanotubes (5,5). So the (n, m) and the diameter of the nanotubes have a close relationship.
3. get (5,5) after the initial point (0,0) to draw a line, this line is the circumference of the carbon nanotubes.
1. will be assumed as the corresponding nanotube (cut after) / graphene planar monolayer of carbon atoms (Figure 1)For hexagonal packing, marking the best method for the definition of the two unit vector (unit vector), the A1 and A2 arrow.A1 and A2 interval is 60 degrees.2. (5,5) refers to 5<a1>+5<a2>, (note that is a vector addition) more widely expressed as:(m, n) = m*<a1> + n*<a2>;
