Figure 7
From: Topological Properties of Electrons in Honeycomb Lattice with Detuned Hopping Energy

Schematics for hopping textures with C6 symmetry.
Molecular graphene realized by decorating the Cu [111] surface with a triangular lattice of CO molecules: (a) t1 > t0 generating topological state, (b) t1 < t0 for trivial state. Gray balls are CO molecules decorated by STM techniques and red thick bonds are shorter than green thin ones which generates the hopping textures.