Figure 2 | Scientific Reports

Figure 2

From: Locating the quantum critical point of the Bose-Hubbard model through singularities of simple observables

Figure 2

Plot (a) First derivative of the variance of the on-site number operator. The curves from top to bottom (around the maximum) correspond to M equal to 402 (black), 302 (red), 202 (green), and 102 (blue), respectively. Plot (b) The position of the maximum of ∂ηVar. Plot (c) ∂ηVar at the maximum. The circles in plots (b) and (c) show QMC data, while the solid lines provide fits (16) and (17), respectively. All plots are for kBT/U = 0.01.

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