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Universal reflective-hierarchical structure of quasiperiodic eigenfunctions and sharp spectral transition in phase
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We prove sharp spectral transition in the arithmetics of phase between localization and singular continuous spectrum for Diophantine almost Mathieu operators. We also determine exact exponential asymptotics of eigenfunctions and of corresponding transfer matrices throughout the localization region. This uncovers a universal structure in their behavior governed by the exponential phase resonances. The structure features a new type of hierarchy, where self-similarity holds upon alternating reflections.
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Anderson localization for multi-frequency quasi-periodic operators on $\mathbb{Z}^d$
For analytic multi-frequency quasi-periodic operators on Z^d, Anderson localization holds at strong coupling for arbitrary number of frequencies and dimension when the phase space dimension is at least d.
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