Spin and energy diffusion become equally slow in a random-field Heisenberg chain at strong disorder, and the frequency-dependent diffusivity points to subdiffusion rather than many-body localization.
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Spin and energy diffusion vs. subdiffusion in disordered spin chains
Spin and energy diffusion become equally slow in a random-field Heisenberg chain at strong disorder, and the frequency-dependent diffusivity points to subdiffusion rather than many-body localization.