SKM 2023 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 42: Poster: Active Matter, Soft Matter, Fluids

DY 42.3: Poster

Donnerstag, 30. März 2023, 13:00–16:00, P1

Pressure in inertial active particle systems with frictional contacts — •Kay-Robert Dormann, Lukas Hecht, and Benno Liebchen — Institut für Physik kondensierter Materie, Technische Universität Darmstadt, Hochschulstr. 8, 64289 Darmstadt, Germany

In systems of isotropic overdamped active Brownian particles (ABPs), the pressure is a state function [1]. It can be shown, that an equation of state (EOS) also exists, if the ABPs are inertial [2]. Here, we explore inertial active Brownian particles [3,4] with additional frictional contacts and find that no EOS exists. We attribute this to the fact that the rotational diffusion depends on density in the presence of frictional contacts.

The breakdown of the EOS due to frictional contacts has interesting implications: for example, when embedding a passive Janus-sphere, whose two hemispheres show a different stiffness, into an active bath, the sphere shows active Brownian motion. In addition, we find that frictional contacts and the associated breakdown of the EOS also have interesting implications for motility-induced phase separation as we will specify on the poster.

[1] A. P. Solon et al., Phys. Rev. Lett. 114, 198301 (2015).

[2] Y. Fily et al., J. Phys. A Math. Theor. 51, 044003 (2018).

[3] S. Mandal et al., Phys. Rev. Lett. 123, 228001 (2019).

[4] L. Hecht et al., Phys. Rev. Lett. 129, 178001 (2022).