Figure 11
(a) The rectangular tiling with translation vectors x and y as given in equation (1)[link]. (b) A commensurate nanotube obtained by rolling up the rectangular tiling in (a) along the chiral vector [{{\bf{v}}_1} = 5{\bf{x}}]. (c) An incommensurate nanotube obtained by rolling up the rectangular tiling in (a) along the chiral vector [{{\bf{v}}_2} = 4{\bf{x}} + 2{\bf{y}}].  [article HTML]

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