Rapid and high-quality formation of dodecagonal quasicrystals and their approximants using a purely mechanical approach

The conditions for forming quasicrystals and their approximants are stringent, normally requiring multiple length scales to stabilize the quasicrystalline order. Here we report an unexpected finding that the approximants and motifs of dodecagonal quasicrystals can be spontaneously formed in the simplest system of identical hard disks, utilizing the unstable feature of the initial square packing subject to mechanical perturbations. Because there is only one length scale involved, this finding advances our knowledge of quasicrystals and their approximants. Remarkably, applying this purely mechanical approach to systems known to form dodecagonal quasicrystals yields quasicrystalline orders athermally and even single quasicrystals that exhibit theoretical tiling patterns of perfect DDQCs. Our study suggests a paradigm for rapid synthesis of high-quality quasicrystals.