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))])
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
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