In the half-filled 2D Hubbard model, the charge diffusion constant follows a robust 1/sqrt(T) scaling across the metal-insulator crossover, with a new Pseudogap Metal state where charge compressibility is insulator-like but transport remains metallic.
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Strange diffusivity of incoherent metal in half-filled two-dimensional Hubbard model
In the half-filled 2D Hubbard model, the charge diffusion constant follows a robust 1/sqrt(T) scaling across the metal-insulator crossover, with a new Pseudogap Metal state where charge compressibility is insulator-like but transport remains metallic.