Mott law as upper bound for a random walk in a random environment

Details Mott law as upper bound for a random walk in a random environment Mott law as upper bound for a random walk in a random environment

2006-08-14

arxiv.org/abs/math-ph/0608033v2

Physics

Mathematical Physics

22 pages. Additional results and corrections.

Scientific paper

We consider a random walk on the support of an ergodic simple point process on R^d, d>1, furnished with independent energy marks. The jump rates of the random walk decay exponentially in the jump length and depend on the energy marks via a Boltzmann-type factor. This is an effective model for the phonon-induced hopping of electrons in disordered solids in the regime of strong Anderson localization. Under mild assumptions on the point process we prove an upper bound of the asymptotic diffusion matrix of the random walk in agreement with Mott law. A lower bound in agreement with Mott law was proved in \cite{FSS}.

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