Abstract
A method is discussed to analyze multifractal properties of spectra and wave functions by means of an entropy function. The method is exemplified on a model for lattice vibrations in an incommensurate crystal phase. It is shown that the model has a spectrum with scaling properties. Moreover, it is probably singular continuous, which is a rather exceptional case. This is even true when the spectrum becomes a fat fractal. The scaling properties of the mode wave functions are discussed.
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