Singular spectrum of Lebesgue measure zero for one-dimensional quasicrystals

Details Singular spectrum of Lebesgue measure zero for one-dimensional quasicrystals Singular spectrum of Lebesgue measure zero for one-dimensional quasicrystals

2001-06-17

arxiv.org/abs/math-ph/0106012v1

Physics

Mathematical Physics

14 pages

Scientific paper

10.1007/s002200200624

The spectrum of one-dimensional discrete Schr\"odinger operators associated to strictly ergodic dynamical systems is shown to coincide with the set of zeros of the Lyapunov exponent if and only if the Lyapunov exponent exists uniformly. This is used to obtain Cantor spectrum of zero Lebesgue measure for all aperiodic subshifts with uniform positive weights. This covers, in particular, all aperiodic subshifts arising from primitive substitutions including new examples as e.g. the Rudin-Shapiro substitution. Our investigation is not based on trace maps. Instead it relies on an Oseledec type theorem due to A. Furman and a uniform ergodic theorem due to the author.

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