Extended Data Figure 7.

DEER Difference signal for R = {1,2,3} (light to dark), compared with the imbalance $𝓘(t)$ for the same parameters. Data are offset for clarity but otherwise share the same axes. $𝓘$ is taken from the same dataset as the R = 1 spin-echo data, with the probe spin excluded from the imbalance calculation. After tJ₀ ≈ 2, the imbalance is essentially constant at the low but finite steady-state value corresponding to this gradient strength. However, correlation dynamics are still progressing- in particular, correlations as measured by the difference signal only begin to develop for R = 2 after this point. This is similar to the disordered MBL state, in which slow entanglement dynamics continue after the locally conserved populations have reached a steady state [10, 11, 30].