Critical States and Fractal Attractors in Fractal Tongues: Localization in the Harper map

Details Critical States and Fractal Attractors in Fractal Tongues: Localization in the Harper map Critical States and Fractal Attractors in Fractal Tongues: Localization in the Harper map

2001-05-08

arxiv.org/abs/nlin/0105013v1

Nonlinear Sciences

Chaotic Dynamics

11 Pages, 5 figures(three eps format and two in gif format)

Scientific paper

Localized states of Harper's equation correspond to strange nonchaotic attractors (SNAs) in the related Harper mapping. In parameter space, these fractal attractors with nonpositive Lyapunov exponents occur in fractally organized tongue--like regions which emanate from the Cantor set of eigenvalues on the critical line $\epsilon = 1$. A topological invariant characterizes wavefunctions corresponding to energies in the gaps in the spectrum. This permits a unique integer labeling of the gaps and also determines their scaling properties as a function of potential strength.

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