Figure 1
From: Antiferromagnetic Metal and Mott Transition on Shastry-Sutherland Lattice
(a) Two dimensional lattice structure of Cu2+ in SrCu2(BO3)2; (b) Sketch of Shastry-Sutherland lattice, which is topologically equivalent to (a). The dashed green line marks the four-site cluster which contains four atoms labeled by 1, 2, 3 and 4. t1 and t2 are the nearest-neighbor hopping energy and the diagonal hopping energy respectively. We set the distance between the nearest neighbors as the length unit and t1 = 1.0 as the energy unit. (c) First Brillouin zone of Shastry-Sutherland lattice. T, K and Γ denote high symmetry points in the first Brillouin zone. (d) Tight-binding band structure for t2 = 1.0; (e) Non-interacting density of states at half-filling for t2 = 0.8, t2 = 1.0 and t2 = 1.2.
