Absolutely continuous spectrum for random operators on trees of finite cone type

Details Absolutely continuous spectrum for random operators on trees of finite cone type Absolutely continuous spectrum for random operators on trees of finite cone type

2011-07-30

arxiv.org/abs/1108.0057v1

Physics

Mathematical Physics

Scientific paper

We study the spectrum of random operators on a large class of trees. These trees have finitely many cone types and they can be constructed by a substitution rule. The random operators are perturbations of Laplace type operators either by random potentials or by random hopping terms, i.e., perturbations of the off-diagonal elements. We prove stability of arbitrary large parts of the absolutely continuous spectrum for sufficiently small but extensive disorder.

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