Extreme Spontaneous Deformations of Active Crystals
| Autor: | Shi, Xia-qing, Cheng, Fu, Chaté, Hugues |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 131, 108301, Published 5 September 2023 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.131.108301 |
| Popis: | We demonstrate that two-dimensional crystals made of active particles can experience extremely large spontaneous deformations without melting. Using particles mostly interacting via pairwise repulsive forces, we show that such active crystals maintain long-range bond order and algebraically-decaying positional order, but with an exponent $\eta$ not limited by the $\tfrac{1}{3}$ bound given by the (equilibrium) KTHNY theory. We rationalize our findings using linear elastic theory and show the existence of two well-defined effective temperatures quantifying respectively large-scale deformations and bond-order fluctuations. The root of these phenomena lies in the sole time-persistence of the intrinsic axes of particles, and they should thus be observed in many different situations. Comment: 6 pages, 4 figures |
| Databáze: | arXiv |
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