Main Question or Discussion Point
We briefly got an intro to carbon nanotubes in our nanomaterials class, and the professor only briefly introduced carbon nanotubes and the ways to describe the different types of tubes via their indices. Why is it that if the indices of the carbon nanotube have the property such that n-m = 3*integer or (n,0) , the carbon nanotube is metallic, otherwise it is a semiconductor. I find it quite fascinating how the folding geometry can affect the properties of the material. It was never explained to us why, however.