Figure 8
From: Antiferromagnetic Metal and Mott Transition on Shastry-Sutherland Lattice
The distribution of spectral weight at zero frequency for different U at T = 0.1, with (a) t2 = 1.2, (b) t2 = 1.0 and (c) t2 = 0.7.
Peaks in the diagrams represent the dominate distribution of electrons with zero energy in momentum space and thus correspond to the location of Fermi surface. When the effect of interaction is small, it behaves like sharp peaks on the two diagonals in the first Brillouin zone, reflecting the Fermi surface at half-filling. With the increasing U and decreasing t2, the renormalization effect becomes stronger and the distribution spread. In (c3) where Mott transition occurs and the system is in the antiferromagnetic phase, no clear patterns of the distribution can be seen.
