# Pseudo-gaps for random hopping models

*Hermann Schulz-Baldes (Friedrich-Alexander-Universitaet Erlangen-Nuernberg)*

**21-Mar-2023, 14:00-15:00 (14 months ago)**

**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.

mathematical physics

Audience: researchers in the discipline

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