Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session B01: Active Matter
11:30 AM–2:18 PM,
Monday, March 6, 2023
Room: Room 124
Sponsoring
Unit:
GSNP
Chair: Daphne Klotsa, UNC Chapel Hill
Abstract: B01.00003 : Long-range velocity correlations in a passive system with active dopants*
12:18 PM–12:30 PM
Presenter:
Leila Abbaspour
(Max Planck Institute for Dynamics and Self-Organization)
Authors:
Leila Abbaspour
(Max Planck Institute for Dynamics and Self-Organization)
Rituparno Mandal
(University of Göttingen)
Peter Sollich
(University of Göttingen)
Stefan Klumpp
(University of Gottingen)
To test whether such long-range velocity correlations require these high densities of active particles, we combined theory and simulation to study an athermal passive dense medium that is agitated by a small fraction of active particles (active dopants). Long-range velocity correlations can indeed be generated in the passive medium by a very small fraction of active dopants if the passive medium is sufficiently dense.
We investigated the dependence of the velocity correlations on the densities of active and passive particles and on the activity parameters: for fixed rotational diffusion, the correlation length remains almost unchanged when one changes the active force. For a fixed self-propulsion force, the correlation length scales with the square root of the persistence time, which is consistent with results for purely active systems. Our work decouples the roles of density and activity in generating such long-range velocity correlations in a non-equilibrium steady state.
*This research was conducted within the Max Planck School Matter to Life, supported by the German Federal Ministry of Education and Research (BMBF) in collaboration with the Max Planck Society.
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