Asymptotically exact probability distribution for the Sinai model with finite drift

Gareth Woods, Igor Yurkevich, Igor V. Lerner, H.A. Kovtun

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    We obtain the exact asymptotic result for the disorder-averaged probability distribution function for a random walk in a biased Sinai model and show that it is characterized by a creeping behavior of the displacement moments with time, <x(n)> similar to v(mu n), where mu <1 is dimensionless mean drift. We employ a method originated in quantum diffusion which is based on the exact mapping of the problem to an imaginary-time Schrodinger equation. For nonzero drift such an equation has an isolated lowest eigenvalue separated by a gap from quasicontinuous excited states, and the eigenstate corresponding to the former governs the long-time asymptotic behavior.
    Original languageEnglish
    Article number30103
    Number of pages4
    JournalPhysical Review E
    Issue number3
    Publication statusPublished - 17 Sept 2010

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    © 2010 The American Physical Society


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