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On the dynamics of quasi-periodic Schrödinger cocycles for positive measure sets of frequencies
KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Mathematics (Div.).ORCID iD: 0000-0003-4368-2833
2025 (English)In: Journal of Spectral Theory, ISSN 1664-039X, E-ISSN 1664-0403Article in journal (Refereed) Epub ahead of print
Abstract [en]

We consider the family of one-frequency quasi-periodic Schrödinger coycles Gω,E​, parametrized by the energy E. For potential functions v(x)=λv0​(x), where v0​∈C2(T,R) is a Morse function with finitely many critical points and λ>0 is large, we show that, for any value of E∈R and for any phase x∗∈T such that ∣v0​(x∗)−E/λ∣ is not too small, there exists a set of frequencies Ω=Ω(E,x∗) of positive measure such that the following hold: (1) for every ω∈Ω, the upper Lyapunov exponent of the cocycle Gω,E​ is ≳logλ and x∗ is (essentially) a typical point in Oseledets’ theorem; (2) either Gω,E​ is uniformly hyperbolic, or there exists a phase x0​∈T such that E is an eigenvalue of the corresponding discrete Schrödinger operator Hx0​,ω​.

Place, publisher, year, edition, pages
European Mathematical Society - EMS - Publishing House GmbH , 2025.
Keywords [en]
Schrödinger cocycle, quasi-periodic, Lyapunov exponents
National Category
Mathematical Analysis
Identifiers
URN: urn:nbn:se:kth:diva-375479DOI: 10.4171/jst/548ISI: 001608298300001OAI: oai:DiVA.org:kth-375479DiVA, id: diva2:2029116
Note

QC 20260120

Available from: 2026-01-16 Created: 2026-01-16 Last updated: 2026-01-20Bibliographically approved

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Bjerklöv, Kristian

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