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SUMMARY:Collective motion of colloidal particles with propulsion induced b
 y time-delayed feedback - Robin Kopp (Technische Universität Berlin)
DTSTART:20231110T140000Z
DTEND:20231110T143000Z
UID:TALK203968@talks.cam.ac.uk
DESCRIPTION:In recent years\, delayed feedback in colloidal systems has be
 come an active and promising field of study in theory [1] and experiments 
 [2\,3]\, key topics being history dependence and the manipulation of trans
 port properties. Based on Brownian dynamics simulations we here study the 
 collective behavior [4] of a two-dimensional system of repulsively interac
 ting colloidal particles\, where each particle is propelled [5] by a non-l
 inear\, time-delayed repulsive feedback force with time delay &tau\;. We f
 irst observe and quantify the emergence of dynamical clustering and sponta
 neous velocity alignment leading to collective motion characterized by a n
 on-zero mean velocity. We then provide an explanation for the underlying m
 echanism of local velocity alignment\, combining single-particle and mean-
 field-like effects. Finally\, we introduce a length scale based argument t
 o explain the global spreading of alignment information in our system\, re
 vealing similarities to Vicsek-like models. [1] S. A. M. Loos\, and S. H. 
 L. Klapp\, Scientific Reports 9\, 2491 (2019) [2] M. A. Fernandez-Rodrigue
 z et al.\, Nature Communications 11\, 4223 (2020) [3] Bell-Davies M. C. R.
 \, Curran A.\, Liu Y. and Dullens R. P. A.\, Phys. Rev. E 107\, 064601 (20
 23) [4] R. A. Kopp and S. H. L Klapp\, EPL 143\, 17002 (2023) [5] R. A. Ko
 pp and S. H. L Klapp\, Phys. Rev. E 107\, 024611 (2023)
LOCATION:Seminar Room 1\, Newton Institute
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