The Density of States Measure of the Weakly Coupled Fibonacci Hamiltonian
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We consider the density of states measure of the Fibonacci Hamiltonian and show that, for small values of the coupling constant V , this measure is exact-dimensional and the almost everywhere value dV of the local scaling exponent is a smooth function of V , is strictly smaller than the Hausdor dimension of the spectrum, and converges to one as V tends to zero. The proof relies on a new connection between the density of states measure of the Fibonacci Hamiltonian and the measure of maximal entropy for the Fibonacci trace map on the non-wandering set in the V -dependent invariant surface. This allows us to make a connection between the spectral problem at hand and the dimension theory of dynamical systems.
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Damanik, David and Gorodetski, Anton. "The Density of States Measure of the Weakly Coupled Fibonacci Hamiltonian." Geometric and Functional Analysis, 22, (2012) Springer: 976-989. http://dx.doi.org/10.1007/s00039-012-0173-8.