Dear Kwant Developers,
I am facing some difficulty in defining the lattice for armchair-edged graphene nanoribbon. To be specific, I am being unable to find out the 'prim_vecs' (primitive vectors) and the 'basis' (coordinates of basis sites) that I should provide to
kwant.lattice.general(prim_vecs, basis=None, name='')
as parameter to obtain the lattice structure of armchair GNR.
As per my understanding, I can find the lattice structure for zigzag-edged GNR by using either the following two approaches:
>
graphene = kwant.lattice.general([(1, 0), (sin_30, cos_30)],
[(0, 0), (0, 1 / sqrt(3))])
or
> graphene= kwant.lattice.honeycomb(a=1, name=’‘, norbs=None)
But I am failing to define the lattice structure for the armchair-edged graphene nanoribbon.
Moreover, as per my understanding, the distance between two adjacent atoms (C-C) in graphene is 0.142nm. So what value of 'a' should I provide in >graphene=kwant.lattice.honeycomb(a=1, name=’‘, norbs=None) to obtain the accurate lattice structure.
In this context I would ask you to kindly guide me to find the solutions of the above mentioned queries.
Thanking you
Regards
Arunabha Ghoshal
