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. 2016 Jun 17;7:11744. doi: 10.1038/ncomms11744

Figure 7. Hexagonal lattice of the trimer metamolecules.

Figure 7

The metamolecules are composed of acoustic cavities indexed as 1, 2 and 3. Blue links show inner connections between the cavities with the strength of coupling (on-site hopping) κ, and the red lines show the nearest-neighbour (off-site) hopping J between metamolecules.