LMP Seminar: Extreme spontaneous deformations of active crystals
LMP Seminar
- Datum: 20.02.2024
- Uhrzeit: 15:00 - 16:30
- Vortragende(r): Prof. Xiaqing Shi
- Center for soft condensed matter physics and interdisciplinary research, Soochow university, China
- Ort: Max-Planck-Institut für Dynamik und Selbstorganisation (MPIDS)
- Raum: Riemannraum 1.40 & ZOOM Meeting ID: 997 1155 2453 Passcode: 771001
- Gastgeber: MPIDS / LMP
- Kontakt: golestanian-office@ds.mpg.de
We demonstrate that two-dimensional crystals made of active particles can experience extremely large spontaneous deformations without melting [1]. 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 a decay exponent whose value is not limited by the 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. We argue that the root of these phenomena lies in the sole time-persistence of the effective noise felt by particles. They should thus be observed in many different situations, a few of which we discuss.
[1] Shi, X., Cheng, F. & Chaté, H. Phys. Rev. Lett. 131, 108301 (2023)
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. We argue that the root of these phenomena lies in the sole time-persistence of the effective noise felt by particles. They should thus be observed in many different situations, a few of which we discuss.
[1] Shi, X., Cheng, F. & Chaté, H. Phys. Rev. Lett. 131, 108301 (2023)