Berlin 2024 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 2: Active Matter I (joint session BP/CPP/DY)

DY 2.12: Vortrag

Montag, 18. März 2024, 12:30–12:45, H 1028

Impact of non-reciprocity on the self-aggregation of an anisotropic colloidal system — •Salman Fariz Navas and Sabine H.L. Klapp — ITP, Technische Universität Berlin, Germany

Non-reciprocal interactions have been demonstrated to introduce interesting collective behaviour in many-body systems[1]. Recent studies involving non-reciprocal colloidal particle systems have shown to induce propulsion mechanisms[2] and cause enhanced diffusion of tracer particles[3]. Such effects can have an impact on aggregation mechanisms as well[2]. Here, we introduce non-reciprocal interactions to a self-aggregating colloidal system with direction dependent, field-induced interactions[4]. In stark contrast to the passive (reciprocal) case, non-reciprocity induces a propulsion mechanism when a pair of particles belonging to different species come in contact. We show that at low degrees of non-reciprocity the aggregation is accelerated. At higher degrees of non-reciprocity, the system even tends to phase separate leading to the coexistence of dilute, freely moving particles and dense clusters.

[1] M. Fruchart, R. Hanai, P. B. Littlewood, and V. Vitelli, Nature 592, 363 (2021).

[2] S. Fehlinger and B. Liebchen, Phys. Rev. Research 5, L032038 (2023).

[3] A. Benois, M. Jardat, V. Dahirel, V. Démery, J. Agudo-Canalejo, R. Golestanian, and P. Illien, Phys. Rev. E 108, 054606 (2023).

[4] F. Kogler, O. D. Velev, C. K. Hall, and S. H. L. Klapp, Soft Matter 11, 7356 (2015).

Keywords: Non-reciprocal interactions; self-aggregation; Brownian dynamics; Induced propulsion