Abstract
We study the long-time behavior of the Schrödinger flow in a heterogeneous potential \(\lambda V\) with small intensity \(0<\lambda \ll 1\) (or alternatively at high frequencies). The main new ingredient, which we introduce in the general setting of a stationary ergodic potential, is an approximate stationary Floquet–Bloch theory that is used to put the perturbed Schrödinger operator into approximate normal form. We apply this approach to quasiperiodic potentials and establish a Nehorošev-type stability result. In particular, this ensures asymptotic ballistic transport up to a stretched exponential timescale \(\exp (\lambda ^{-\frac{1}{s}})\) for some \(s>0\). More precisely, the approximate normal form leads to an accurate long-time description of the Schrödinger flow as an effective unitary correction of the free flow. The approach is robust and generically applies to linear waves. For classical waves, for instance, this allows to extend diffractive geometric optics to quasiperiodically perturbed media.
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Acknowledgements
The authors warmly thank László Erdős and Tom Spencer for some stimulating discussions on this problem. The work of MD was supported by F.R.S.-FNRS and by the CNRS-Momentum program. Financial support is acknowledged from the European Research Council under the European Community’s Seventh Framework Programme (FP7/2014-2019 Grant Agreement QUANTHOM 335410) and European Union’s Horizon 2020 research and innovation programme under grant agreement No 864066.
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Duerinckx, M., Gloria, A. & Shirley, C. Approximate Normal Forms via Floquet–Bloch Theory: Nehorošev Stability for Linear Waves in Quasiperiodic Media. Commun. Math. Phys. 383, 633–683 (2021). https://doi.org/10.1007/s00220-021-03966-7
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DOI: https://doi.org/10.1007/s00220-021-03966-7