Dresden 2020 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 54: Poster: Active Matter and Microswimmers (joint session DY/TT)
DY 54.9: Poster
Thursday, March 19, 2020, 15:00–18:00, P1A
Can a passive colloid in an active bath be modeled as an active Brownian particle? — •Jeanine Shea1, Friederike Schmid1, and Gerhard Jung2 — 1Johannes Gutenberg University — 2University of Innsbruck
Passive colloids in baths of active particles exhibit vastly different behavior than passive colloids in thermal baths. In particular, Wu and Libchaber [1] found experimentally that a passive colloid immersed in an active bath exhibits superdiffusive behavior on short time scales and normal diffusive behavior in the long-time limit. This behavior is analogous to that of an active particle, which is characterized by this transition between superdiffusive and diffusive behavior. Although Wu and Libchaber were able to relate this crossover time to experimental observables such as the length scale of collective motion, they did not explicitly relate the parameters of the system of active particles, such as the density, the rotational diffusion coefficient, or the force of active particles, to this characteristic crossover time. We investigate the detailed mechanisms that lead to the ``activity" of the passive colloid and aim to explicitly map the dynamics of a passive colloid in an active bath to the model of an Active Brownian Particle.
[1] Wu, X.-L., and A. Libchaber, 2000, ``Particle diffusion in a quasi-two-dimensional bacterial bath," Phys. Rev. Lett. 84, 3017-3020.