Universal behavior for single-file diffusion on a disordered fractal

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We study single-file diffusion on a one-dimensional lattice with a random fractal distribution of hopping rates. For finite lattices, this problem shows three clearly different regimes, namely, nearly independent particles, highly interacting particles, and saturation. The mean-square displacement of a tagged particle as a function of time follows a power law in each regime. The first crossover time tₛ, between the first and the second regime, depends on the particle density. The other crossover time tₗ, between the second and the third regime, depends on the lattice length. We find analytic expressions for these dependencies and show how the general behavior can be characterized by an universal form. We also show that the mean-square displacement of the center of mass presents two regimes; anomalous diffusion for times shorter than tₗ, and normal diffusion for times longer than tₗ. We study single-file diffusion on a one-dimensional lattice with a random fractal distribution of hopping rates. For finite lattices, this problem shows three clearly different regimes, namely, nearly independent particles, highly interacting particles, and saturation. The mean-square displacement of a tagged particle as a function of time follows a power law in each regime. The first crossover time tₛ, between the first and the second regime, depends on the particle density. The other crossover time tₗ, between the second and the third regime, depends on the lattice length. We find analytic expressions for these dependencies and show how the general behavior can be characterized by an universal form. We also show that the mean-square displacement of the center of mass presents two regimes; anomalous diffusion for times shorter than tₗ, and normal diffusion for times longer than tₗ.