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

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When the modulation is uniform within the crystal (modulation phase shown in a), each trimer is driven with the same phase, and transmission between two points via the edge mode is topologically protected (acoustic pressure, c). Remarkably, this behaviour is not affected if each trimer is independently modulated with a random modulation phase (b), and the same acoustic edge mode is excited, both in amplitude and phase (d).