Figure 3
Derivative of the variance of the on-site number operator.
The curves from top to bottom in the main plot correspond to temperatures kBT/U equal to 0.005 (black), 0.02 (red), 0.04 (green), 0.06 (blue), respectively. Upper inset illustrates the convergence of our results towards the T = 0 limit. It shows our three lowest-temperature results: from top to bottom kBT/U equals 0.005 (black), 0.01 (green), and 0.015 (blue), respectively. Lower inset shows the same as the main plot but for kBT/U = 0.08. The system size is M = 402 for all the calculations in this figure.
