We present an extended microcanonical Lanczos method for a direct evaluation of the diffusion constant and its frequency dependence within the disordered Anderson model of noninteracting particles. The method allows to study systems beyond ${10}^6$ sites of hypercubic lattices in $d=3–7$ dimensions. Below the transition to localization where we confirm dynamical scaling behavior of interest is a wide region of incoherent diffusion, similar to percolating phenomena and to interacting many-body localized systems.

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• Anderson localization
• Diffusion
• High dimensional systems
• Numerical techniques