sknano.structures.compute_N

sknano.structures.compute_N(*Ch)

Compute $N = \frac{2(n^2+m^2+nm)}{d_R}$.

$N$ is the number of graphene hexagons mapped to a nanotube unit cell.

Parameters:

*Ch : {tuple or ints}

Either a 2-tuple of ints or 2 integers giving the chiral indices of the nanotube chiral vector $\mathbf{C}_h = n\mathbf{a}_1 + m\mathbf{a}_2 = (n, m)$.

Returns:

int

Number of hexagons per nanotube unit cell: $N = \frac{2(n^2+m^2+nm)}{d_R}$.