Thermodynamical fingerprints of fractal spectra

Details Thermodynamical fingerprints of fractal spectra Thermodynamical fingerprints of fractal spectra

1998-03-24

arxiv.org/abs/cond-mat/9803294v1

Physics

Condensed Matter

Statistical Mechanics

8 latex pages, 9 embedded PS figures

Scientific paper

10.1103/PhysRevE.58.4134

We investigate the thermodynamics of model systems exhibiting two-scale fractal spectra. In particular, we present both analytical and numerical studies on the temperature dependence of the vibrational and electronic specific heats. For phonons, and for bosons in general, we show that the average specific heat can be associated to the average (power law) density of states. The corrections to this average behavior are log-periodic oscillations which can be traced back to the self-similarity of the spectral staircase. In the electronic case, even if the thermodynamical quantities exhibit a strong dependence on the particle number, regularities arise when special cases are considered. Applications to substitutional and hierarchical structures are discussed.

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