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Although concrete operators with singular continuous spectrum have proliferated re-, we still don't really understand much about singular continuous spectrum. In part, this is because it is normally defined by what it isn't — neither pure point nor absolutely continuous. An important point of view, going back in part to Rodgers and Taylor [27,28], and… (More)

- S. Jitomirskaya, B. Simon
- 1994

We prove that one-dimensional Schrr odinger operators with even almost periodic potential have no point spectrum for a dense G in the hull. This implies purely singular continuous spectrum for the almost Mathieu equation for coupling larger than 2 and a dense G in even if the frequency is an irrational with good Diophantine properties. x1. Introduction This… (More)

A random polymer model is a one-dimensional Jacobi matrix randomly composed of two finite building blocks. If the two associated transfer matrices commute, the corresponding energy is called critical. Such critical energies appear in physical models, an example being the widely studied random dimer model. It is proven that the Lyapunov exponent vanishes… (More)

- Artur Avila, Svetlana Jitomirskaya, SVETLANA JITOMIRSKAYA
- 2009

We prove the conjecture (known as the " Ten Martini Problem " after Kac and Simon) that the spectrum of the almost Mathieu operator is a Cantor set for all nonzero values of the coupling and all irrational frequencies.

We study the almost Mathieu operator (h λ,α,θ u)(n) = u(n + 1) + u(n − 1) + λ cos(παn + θ)u(n) on 2 (Z), and prove that the dual of point spectrum is absolutely continuous spectrum. We use this to show that for λ = 2 it has purely singular continuous spectrum for a.e. pairs (α, θ). The α's for which we prove this are explicit. Our main goal in this paper is… (More)

- J Bourgain, S Jitomirskaya
- 2007

- Mihai Stoiciu, David Damanik, Serguei Denissov, Rowan Killip, Svetlana Jitomirskaya, Kathy Carreon +4 others
- 2005

ii c 2005 Mihai Stoiciu All Rights Reserved iii Acknowledgements I would like to express my deepest gratitude to my advisor, Professor Barry Simon, for his help and guidance during my graduate studies at Caltech. During the time I worked under his supervision, Professor Simon provided a highly motivating and challenging scientific environment, which was… (More)

We examine various issues relevant to localization in the Anderson model. We show there is more to localization than exponentially localized states by presenting an example with such states but where x(t) 2 /t 2−δ is unbounded for any δ > 0. We show that the recently discovered instability of localization under rank one perturbations is only a weak… (More)

In a variety of contexts, we prove that singular continuous spectrum is generic in the sense that for certain natural complete metric spaces of operators, those with singular spectrum are a dense G δ. In the spectral analysis of various operators of mathematical physics, a key step, often the hardest, is to prove that the operator has no continuous singular… (More)

We prove that for any > 2 and a.e. !; the point spectrum of the almost Mathieu operator (H())) n = n?1 + n+1 + cos(2(+ n!))) n contains the essential closure ess of the spectrum. Corresponding eigenfunctions decay exponentially. The singular continuous component, if it exists, is concentrated on a zero measure set which is nowhere dense in ess :