Volume 125, Number 5, March 2019
|Number of page(s)||7|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||17 April 2019|
Cooperative motion and shear strain correlations in dense 2D systems of self-propelled soft disks
1 Department of Physics and Astronomy and Quantum Matter Institute, University of British Columbia Vancouver, British Columbia V6T 1Z1, Canada
2 Département de Physique, École normale supérieure de Lyon - 69364 Lyon Cedex 07, France
3 Département de Physique, Université Claude Bernard Lyon 1 - 69622 Villeurbanne Cedex, France
Received: 11 December 2018
Accepted: 11 March 2019
We present a detailed study of cooperative and correlated dynamics in a 2D model system for soft active matter that undergoes motility-induced phase separation (MIPS). Particle displacement correlation functions reveal increasing dynamical heterogeneity with increasing activity. In the phase-separated regime as well as in the truly glassy phase, transverse mean squared displacements as well as shear strain correlations exhibit a regime of long-range behaviour with strain correlations decaying as r−2 on time scales short compared to the rotational diffusion time. We attribute the origin of the r−2 decay to elastic interactions that lead to similar behaviour in passive glass formers.
PACS: 81.05.Kf – Glasses (including metallic glasses) / 64.75.Xc – Phase separation and segregation in colloidal systems / 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion
© EPLA, 2019
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