Figure 1 | Scientific Reports

Figure 1

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

Figure 1

The variance of the on-site number operator.

The circles provide QMC data while the solid lines are Padé approximants (15) fitted to the numerics with parameters m ≤ 9 and n ≤ 6 (the lower the temperature the higher order polynomials are needed to fit the numerics). The curves from bottom to top (in the left part of the plot) correspond to temperatures kBT/U equal to 0.005 (black), 0.04 (red), 0.06 (green), respectively. The system size is M = 402.

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