Singular continuous spectrum for singular potential
classification
🧮 math.SP
math-phmath.MP
keywords
alphathetasingularcontinuousdeltameromorphicpotentialsspectrum
read the original abstract
We prove that Schr\"odinger operators with meromorphic potentials $(H_{\alpha,\theta}u)_n=u_{n+1}+u_{n-1}+ \frac{g(\theta+n\alpha)}{f(\theta+n\alpha)} u_n$ have purely singular continuous spectrum on the set $\{E: L(E)<\delta{(\alpha,\theta)}\}$, where $\delta$ is an explicit function, and $L$ is the Lyapunov exponent. This extends results of Jitomirskaya and Liu for the Maryland model and of Avila, You and Zhou for the almost Mathieu operator, to the general family of meromorphic potentials.
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