Abstract：
:Graphene, a honeycomb lattice of carbon atoms ruled by tight-binding interaction, exhibits extraordinary electronic properties due to the presence of Dirac cones within its band structure. These intriguing singularities have naturally motivated the discovery of their classical analogues. In this work, we present a general and direct procedure to reproduce the peculiar physics of graphene within a very simple acoustic metamaterial: a double lattice of soda cans resonating at two different frequencies. The first triangular sub-lattice generates a bandgap at low frequency, which induces a tight-binding coupling between the resonant defects of the second honeycomb one, hence allowing us to obtain a graphene-like band structure. We prove the relevance of this approach by showing that both numerical and experimental dispersion relations exhibit the requested Dirac cone. We also demonstrate the straightforward monitoring of the coupling strength within the crystal of resonant defects. This work shows that crystalline metamaterials are very promising candidates to investigate tantalizing solid-state physics phenomena with classical waves.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Yves S,Lemoult F,Fink M,Lerosey Gdoi
10.1038/s41598-017-15335-3subject
Has Abstractpub_date
2017-11-10 00:00:00pages
15359issue
1issn
2045-2322pii
10.1038/s41598-017-15335-3journal_volume
7pub_type
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