For the 2D quantum transverse-field XY model, fidelity susceptibility crossover scaling yields a crossover exponent phi = 1.0(2), implying the phase boundary rises linearly with anisotropy near the multicritical point.
Hasenbusch, Phys
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Multicritical behavior of the fidelity susceptibility for the 2D quantum transverse-field $XY$ model
For the 2D quantum transverse-field XY model, fidelity susceptibility crossover scaling yields a crossover exponent phi = 1.0(2), implying the phase boundary rises linearly with anisotropy near the multicritical point.