Figure 2
From: Quantum phase transition induced by real-space topology
Schematic illustration of the lattice systems, which are employed to construct the systems (a) with different real-space topologies. We consider two types of lattices: (c) A honeycomb lattice; (d) A square lattice. A cut or broken torus is presented by the weak or zero hopping constants, which are indicated by dashed lines. The site index of two types of lattices is indicated in (b).
