Fig. 6.

Projected XXZ chain at infinite Δ. Time evolution of the spin diffusion constant given by the Hamiltonian Eq. 4 coupled to spin dephasing with different values of coupling strength γ is shown. While the γ = 0 case shows diffusion (the dotted horizontal line indicates the value $D=\frac{4}{3\pi }$ predicted by GHD), any finite γ leads to subdiffusion at all times $D(t)\sim t^{-1/2}$ (the shaded regions), with time dependence solely fixed by the rescaled time γt as shown in Right.