Fig. 5: Parameterising the spinon ground state energy.
From: Correlation holes and slow dynamics induced by fractional statistics in gapped quantum spin liquids

Average ground state energy of a spinon subjected to a vison distribution in which there exists an empty disc of radius ξ (blue circles), or the vison-depleted region forms a strip of width 2ξ that wraps around the torus in one direction (red triangles), surrounded by a disordered region of π-fluxes with average density 1/2. The dashed and dotted lines correspond to the best fit to functions shown in the legend. The data are averaged over 250 flux realisations in a system of size L2 = 402, and the error bars denote the standard deviation of the energy at a given disc radius, not the error in the mean. The parametrisation chosen for E(ξ) on the vertical axis is merely a matter of convenience.