Discrete Breathers in One-Dimensional Diatomic Granular Crystals

Abstract

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.

5 pages, 4 figures

References in corpus (2)

• How Hertzian solitary waves interact with boundaries in a 1-D granular medium
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