Discrete Breathers in One-Dimensional Diatomic Granular Crystals

Details Discrete Breathers in One-Dimensional Diatomic Granular Crystals Discrete Breathers in One-Dimensional Diatomic Granular Crystals

2009-11-14

arxiv.org/abs/0911.2817v1

Nonlinear Sciences

Pattern Formation and Solitons

5 pages, 4 figures

Scientific paper

We report the experimental observation of discrete breathers in a one-dimensional diatomic granular crystal composed of compressed elastic beads that interact via Hertzian contact. We first characterize their effective linear spectrum both theoretically and experimentally. We then illustrate theoretically and numerically the modulational instability of the lower edge of the optical band. This leads to the dynamical formation of long-lived breather structures, whose families of solutions we compute throughout the linear spectral gap. Finally, we observe experimentally such localized breathing modes with quantitative characteristics that agree with our numerical results.

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