| Issue |
EPL
Volume 125, Number 5, March 2019
|
|
|---|---|---|
| Article Number | 58004 | |
| Number of page(s) | 7 | |
| Section | Interdisciplinary Physics and Related Areas of Science and Technology | |
| DOI | https://doi.org/10.1209/0295-5075/125/58004 | |
| 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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.