Abstract
We study multi-frequency quasiperiodic Schrödinger operators on \({\mathbb {Z}}\). We prove that for a large real analytic potential satisfying certain restrictions the spectrum consists of a single interval. The result is a consequence of a criterion for the spectrum to contain an interval at a given location that we establish non-perturbatively in the regime of positive Lyapunov exponent.
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The first author was partially supported by an NSERC Grant. The second author was partially supported by the NSF, DMS-1500696.
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Goldstein, M., Schlag, W. & Voda, M. On the spectrum of multi-frequency quasiperiodic Schrödinger operators with large coupling. Invent. math. 217, 603–701 (2019). https://doi.org/10.1007/s00222-019-00872-7
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DOI: https://doi.org/10.1007/s00222-019-00872-7