Odd dynamics of living chiral crystals

Tzer Han Tan, Alexander Mietke, Junang Li, Yuchao Chen, Hugh Higinbotham, Peter J. Foster, Shreyas Gokhale, Jörn Dunkel and Nikta Fakhri ()
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Tzer Han Tan: Massachusetts Institute of Technology
Alexander Mietke: Massachusetts Institute of Technology
Junang Li: Massachusetts Institute of Technology
Yuchao Chen: Massachusetts Institute of Technology
Hugh Higinbotham: Massachusetts Institute of Technology
Peter J. Foster: Massachusetts Institute of Technology
Shreyas Gokhale: Massachusetts Institute of Technology
Jörn Dunkel: Massachusetts Institute of Technology
Nikta Fakhri: Massachusetts Institute of Technology

Nature, 2022, vol. 607, issue 7918, 287-293

Abstract: Abstract Active crystals are highly ordered structures that emerge from the self-organization of motile objects, and have been widely studied in synthetic1,2 and bacterial3,4 active matter. Whether persistent crystalline order can emerge in groups of autonomously developing multicellular organisms is currently unknown. Here we show that swimming starfish embryos spontaneously assemble into chiral crystals that span thousands of spinning organisms and persist for tens of hours. Combining experiments, theory and simulations, we demonstrate that the formation, dynamics and dissolution of these living crystals are controlled by the hydrodynamic properties and the natural development of embryos. Remarkably, living chiral crystals exhibit self-sustained chiral oscillations as well as various unconventional deformation response behaviours recently predicted for odd elastic materials5,6. Our results provide direct experimental evidence for how non-reciprocal interactions between autonomous multicellular components may facilitate non-equilibrium phases of chiral active matter.

Date: 2022
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DOI: 10.1038/s41586-022-04889-6

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