defining lattice for armchair graphene nanoribbon (AGNR)
Dear Kwant Developers, I am facing some difficulty in defining the lattice for armchairedged 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 zigzagedged 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 armchairedged graphene nanoribbon. Moreover, as per my understanding, the distance between two adjacent atoms (CC) 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
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Arunabha Ghoshal