SKM 2023 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 53: Active Matter V (joint session BP/CPP/DY)

DY 53.3: Vortrag

Freitag, 31. März 2023, 10:15–10:30, TOE 317

Odd dynamics of living chiral crystals — •Tzer Han Tan1,2,3,4, Alexander Mietke4,5, Junang Li4, Yuchao Chen4, Hugh Higinbotham4, Peter Foster4, Shreyas Gokhale4, Jorn Dunkel4, and Nikta Fakhri41MPI-PKS, Dresden, Germany — 2MPI-CBG, Dresden, Germany — 3CSBD, Dresden, Germany — 4MIT, Cambridge, USA — 5University of Bristol, Bristol, UK

Active crystals are highly ordered structures that emerge from the self-organization of motile objects, and have been widely studied in synthetic and bacterial 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 materials. Our results provide direct experimental evidence for how non-reciprocal interactions between autonomous multicellular components may facilitate non-equilibrium phases of chiral active matter.

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