Nonperiodic echoes from mushroom billiard hats

Details Nonperiodic echoes from mushroom billiard hats Nonperiodic echoes from mushroom billiard hats

2006-11-07

arxiv.org/abs/nlin/0611015v1

Phys. Rev. E 74, 056207 (2006)

Nonlinear Sciences

Chaotic Dynamics

Submitted to Phys. Rev. E without the appendix

Scientific paper

10.1103/PhysRevE.74.056207

Mushroom billiards have the remarkable property to show one or more clear cut integrable islands in one or several chaotic seas, without any fractal boundaries. The islands correspond to orbits confined to the hats of the mushrooms, which they share with the chaotic orbits. It is thus interesting to ask how long a chaotic orbit will remain in the hat before returning to the stem. This question is equivalent to the inquiry about delay times for scattering from the hat of the mushroom into an opening where the stem should be. For fixed angular momentum we find that no more than three different delay times are possible. This induces striking nonperiodic structures in the delay times that may be of importance for mesoscopic devices and should be accessible to microwave experiments.

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