Dresden 2020 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 22: Active Matter II (joint session BP/CPP/DY)

DY 22.3: Talk

Tuesday, March 17, 2020, 10:00–10:15, HÜL 386

Diffusing Activity: Active Particles in Evolving Environments — •Nima H. Siboni, S. Mohsen J. Khadem, and Sabine H. L. Klapp — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany

We study the dynamics of a single active Brownian particle (ABP) and the collective behavior of interacting ABPs in a heterogeneous medium. We apply the idea of the diffusing diffusivity model [1] to mimic the environmental heterogeneity in the equation of motion of the ABPs via a time-dependent activity and diffusivities. In our model, the fluctuations of the environment affect simultaneously and similarly the motility and diffusion coefficients. We obtain analytically the probability distribution function of the particle displacement and its moments and support our results via particle-based simulations. We finally investigate the impact of the introduced fluctuations on the collective behavior of ABPs. We obtain the phase diagram of motility-induced phase separation [2,3] for a wide range of noise strength and compare our results with that for the conventional ABPs [4].

[1] M. V. Chubynsky and G. W. Slater, Phys. Rev. Lett. 113, 098302 (2014).

[2] I. Buttinoni, J. Bialké, F. Kümmel, H. Löwen, C. Bechinger, and T. Speck, Phys. Rev. L. 110, 238301 (2013).

[3] J. Stenhammar, A. Tiribocchi, R. J. Allen, D. Marenduzzo, and M. E. Cates, Phys. Rev. L. 111, 145702 (2013).

[4] S. M. J. Khadem, N. H. Siboni, and S. H. L. Klapp, in preparation.