Pseudo-gaps for random hopping models
Hermann Schulz-Baldes (Friedrich-Alexander-Universitaet Erlangen-Nuernberg)
Abstract: For one-dimensional random Schrödinger operators, the integrated density of states is known to be given in terms of the (averaged) rotation number of the Pr¨ufer phase dynamics. This paper develops a controlled perturbation theory for the rotation number around an energy at which all the transfer matrices commute and are hyperbolic. Such a hyperbolic critical energy appears in random hopping models. The main result is a Hölder continuity of the rotation number at the critical energy that implies the existence of a pseudo-gap. The proof uses renewal theory. The result is illustrated by numerics.
Audience: researchers in the discipline
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