Penta-Tubes: Rolled-Up Penta-Graphene.It is well known that theelectronic properties of carbon nanotubes are closely related tographene according to the zone folding approximation (39). Dueto the gapless semimetallic feature of graphene, the electronicproperties of carbon nanotubes are highly chirality-dependent:a carbon nanotube is metallic only when its chiral vector (n, m)
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