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arXiv · 1209.1735

Multiscale Analysis in Momentum Space for Quasi-periodic Potential in Dimension Two

Yulia Karpeshina·Roman Shterenberg
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Abstract

We consider a polyharmonic operator $H=(-\Delta)^l+V(\x)$ in dimension two with $l\geq 2$, $l$ being an integer, and a quasi-periodic potential $V(\x)$. We prove that the absolutely continuous spectrum of $H$ contains a semiaxis and there is a family of generalized eigenfunctions at every point of this semiaxis with the following properties. First, the eigenfunctions are close to plane waves $e^{i< \k,\x>}$ at the high energy region. Second, the isoenergetic curves in the space of momenta $\k$ corresponding to these eigenfunctions have a form of slightly distorted circles with holes (Cantor type structure). A new method of multiscale analysis in the momentum space is developed to prove these results.

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Yulia Karpeshina, Roman Shterenberg. 2012-09-08. Multiscale Analysis in Momentum Space for Quasi-periodic Potential in Dimension Two. https://doi.org/10.1063/1.4811547

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