Figure 5
From: Protecting quantum correlations of the XXZ model by topological boundary conditions

Modified geometric discord versus B and b in the topological XXZ model and the periodical XXZ model with T = 1, J = 1 and Jz = 1.5. The maximum values of discord are 0.32, 0.32 and 0.11 for the topological case (a–c)] and 0.16, 0.16 and 0.04 for the periodical case (a′–c′).