Gibbs-like measure for spectrum of a class of one-dimensional Schrödinger operator with Sturm potentials

Details Gibbs-like measure for spectrum of a class of one-dimensional Schrödinger operator with Sturm potentials Gibbs-like measure for spectrum of a class of one-dimensional Schrödinger operator with Sturm potentials

2009-09-12

arxiv.org/abs/0909.2301v1

Mathematics

Dynamical Systems

19 pages

Scientific paper

Let $\alpha\in(0,1)$ be an irrational, and $[0;a_1,a_2,...]$ the continued fraction expansion of $\alpha$. Let $H_{\alpha,V}$ be the one-dimensional Schr\"odinger operator with Sturm potential of frequency $\alpha$. Suppose the potential strength $V$ is large enough and $(a_i)_{i\ge1}$ is bounded. We prove that the spectral generating bands possess properties of bounded distortion, bounded covariation and there exists Gibbs-like measure on the spectrum $\sigma(H_{\alpha,V})$. As an application, we prove that $$\dim_H \sigma(H_{\alpha,V})=s_*,\quad \bar{\dim}_B \sigma(H_{\alpha,V})=s^*,$$ where $s_*$ and $s^*$ are lower and upper pre-dimensions.

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