You can do both, it is up to you. One solution is to have two 2D graphene lattices and manually fix the hopping between the two lattices.
Le 10 oct. 2018 à 10:47, Marc Vila email@example.com a écrit :
Dear Kwant developers,
If I want to model a bilayer-type structure like bilayer graphene or phosphorene, do I need to work in three dimensions being the perpendicular lattice constant the interlayer spacing? Or can I still work in two-dimensions since these materials are two-dimensional when the material is periodic in the plane?
Thanks in advance for the help!