Extended Data Fig. 3: Spin correlations in squeezed space.
From: Direct observation of incommensurate magnetism in Hubbard chains
a, Doublon–hole correlations, measured by g2(x). The strong bunching at |x| = 1 reveals neighbouring doublon–hole pairs as mostly stemming from quantum fluctuations. This justifies our extension of the squeezed-space concept away from U → ∞. b, Spin correlations in the zero-magnetization sector at the centre of the cloud. Averaging over different polarizations (blue) results in a faster decay of the spin correlations with distance x in squeezed space compared to the Sz = 0 sector (green). Exponential fits of the correlation envelope for distances x = 2, …, 6 yield ξavg = 1.3(1) without magnetization post-selection and ξ0 = 2(1) in the Sz = 0 sector. Error bars denote one standard error of the mean.
