Spectral behavior of quasi periodic potentials
@article{Sarnak1982SpectralBO, title={Spectral behavior of quasi periodic potentials}, author={P. Sarnak}, journal={Communications in Mathematical Physics}, year={1982}, volume={84}, pages={377-401} }
Spectral properties of Schrödinger operators of the typeHɛ=−Δ+ɛV, where Δ is the Laplacian,V a quasiperiodic potential and ɛ a coupling constant, are developed.V is taken to be finite sum of exponentials with generic frequencies. For small ɛ a strong stability is shown. On the other hand, examples (in the finite diffeence case) are given, for which a transition in the type of spectrum occurs, as ɛ is increased.
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