SKM 2021 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 5: Poster Session III: Statistical Physics, Complex Fluids and Soft Matter

DY 5.4: Poster

Tuesday, September 28, 2021, 17:30–19:30, P

Emergence of collective motion in two-dimensional colloidal systems with delayed feedback — •Robin A. Kopp and Sabine H. L. Klapp — ITP, TU Berlin, Berlin, Germany

In recent years, delayed feedback (dFB) in colloidal systems has become an active and promising field of study [1,2,3], key topics being history dependence and the manipulation of transport properties. Here we study the dynamics of a two-dimensional colloidal suspension, subject to time-delayed feedback. To this end we perform overdamped Brownian dynamics simulations, where the particles interact through a Weeks-Chandler-Andersen (WCA) potential. Furthermore, each particle is subject to a Gaussian, repulsive feedback potential (cf. [1]), that depends on the difference of the particle position at the current time, r_i(t) and the particle position at an earlier time, r_i(t−τ_delay). We observe the emergence of collective motion characterized by a nonzero mean velocity. After quantitatively studying this phenomenon, we also provide a possible explanation combining single-particle and mean-field-like effects.

[1] S. Tarama, S. U. Egelhaaf, and H. Löwen, Physical Review E 100, 022609 (2019)
[2] R. Gernert and S. H. L. Klapp, Physical Review E 92, 022132 (2015)
[3] S. A. M. Loos, and S. H. L. Klapp, Scientific Reports 9, 2491 (2019)