Construction of Carbon Nanotubes with Different Parameters

Four carbon nanotubes with different wrapping constants (n1, n2) are constructed with the 2-D lattice (a = 2.459512, b = 2.459512, γ = 120), P6 lattice symmetry, and one-carbon fractional coordinates (1/3, 2/3, 0). In each nanotube, there are n1*7 cells shown in cyan with the origin of the lattice highlighted in red and one complete wrapping round in magenta.