Footage of thousands of tiny metal spheres set jiggling in a shallow tray has revealed an arrangement of particles once considered impossible.
. Though still far from common, it's a structure that isn't as forbidden as physicists once thought, forming spontaneously from particles on a variety of scales, including among objects easily rearranged with a jiggle.
Starting with computer simulations, the researchers identified a relationship of sphere sizes and a ratio of small-to-large particles, making up a mixture that could potentially fall into arrangements that reflect a long-range quasicrystal symmetry. This was used as the basis of an experiment that combined 3,840 non-magnetic steel spheres of two different diameters – one just under 2.4 millimeters, the other half that size – in a shallow container.
After a week of jostling, the researchers had a good measure of the appearance of small, localized configurations of small and large metal beads, and the ways these 'tiles' repeated over time and across the container.
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