2014/03/30 by David Damanik, Anton Gorodetski, William Yessen · 72 citations
Materials Science · Mathematics · Physics and Astronomy · #Advanced Mathematical Theories and Applications #Cantor set #Combinatorics #Density of states #Exponent #Fibonacci number #Hamiltonian (control theory) #Mathematical Dynamics and Fractals #Mathematical analysis #Mathematics #Measure (data warehouse) #Physics #Pure mathematics #Quantum mechanics #Quasicrystal Structures and Properties #Spectral density #Statistical physics #Statistics #math-ph #math.DS #math.MP #math.SP
paper · pdf · doi:10.1007/s00222-016-0660-x
published in Inventiones mathematicae 206(3), 629-692 (Springer Science+Business Media) · 47 pages
arxiv created 2014/03/30 · openalex publication_date 2016/04/08 · arxiv updated 2019/02/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We consider the Fibonacci Hamiltonian, the central model in the study of electronic properties of one-dimensional quasicrystals, and provide a detailed description of its spectrum and spectral characteristics (namely, the optimal Hölder exponent of the integrated density of states, the dimension of the density of states measure, the dimension of the spectrum, and the upper transport exponent) for all values of the coupling constant (in contrast to all previous quantitative results, which could be established only in the regime of small or large coupling). In particular, we show that the spectrum of this operator is a dynamically defined Cantor set and that the density of states measure is exact-dimensional; this implies that all standard fractal dimensions coincide in each case. We show that all the gaps of the spectrum allowed by the gap labeling theorem are open for all values of the coupling constant. Also, we establish strict inequalities between the four spectral characteristics in question, and provide the exact large coupling asymptotics of the dimension of the density of states measure (for the other three quantities, the large coupling asymptotics were known before). A crucial ingredient of the paper is the relation between spectral properties of the Fibonacci Hamiltonian and dynamical properties of the Fibonacci trace map (such as dimensional characteristics of the non-wandering hyperbolic set and its measure of maximal entropy as well as other equilibrium measures, topological entropy, multipliers of periodic orbits). We establish exact identities relating the spectral and dynamical quantities, and show the connection between the spectral quantities and the thermodynamic pressure function.