English: Letters (n, m) indicate the number of unit vectors in an infinite graphene sheet and Ch is a ‘rolled up’ vector. T denotes the tube axis, and a1 and a2 are the unit vectors of graphene. If m = 0, the CNTs are called ‘zigzag’, and when n = m, the CNTs are called ‘armchair’. Otherwise, the CNTs are simply ‘chiral’.
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