sknano.structures.compute_Natoms_per_unit_cell

sknano.structures.compute_Natoms_per_unit_cell(*Ch)

Compute $N_{\mathrm{atoms/cell}} = 2N$.

$$N_{\mathrm{atoms}} = 2N = \frac{4(n^2 + m^2 + nm)}{d_R}$$

where $N$ is the number of graphene hexagons mapped to the 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:

`2N` : int

Number of atoms in nanotube unit cell: N_{mathrm{atoms}} = 2N = frac{4(n^2 + m^2 + nm)}{d_R}