Linear response approach to active Brownian particles in time-varying activity fields

Merlitz, Holger; Vuijk, Hidde D.; Brader, Joseph M.; Sharma, Abhinav; Sommer, Jens-Uwe

doi:10.1063/1.5025760

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Journal article

Linear response approach to active Brownian particles in time-varying activity fields

Merlitz, Holger Leibniz-Institut für Polymerforschung Dresden, Institut Theorie der Polymere, Dresden, Germany
Vuijk, Hidde D. Leibniz-Institut für Polymerforschung Dresden, Institut Theorie der Polymere, Dresden, Germany
Brader, Joseph M. Department of Physics, University of Fribourg, Switzerland
Sharma, Abhinav Leibniz-Institut für Polymerforschung Dresden, Institut Theorie der Polymere, Dresden, Germany
Sommer, Jens-Uwe Leibniz-Institut für Polymerforschung Dresden, Institut Theorie der Polymere, Dresden, Germany - Technische Universität Dresden, Institute of Theoretical Physics, Dresden, Germany

21.05.2018

Published in:

The Journal of Chemical Physics. - 2018, vol. 148, no. 19, p. 194116

English In a theoretical and simulation study, active Brownian particles (ABPs) in three- dimensional bulk systems are exposed to time-varying sinusoidal activity waves that are running through the system. A linear response (Green-Kubo) formalism is applied to derive fully analytical expressions for the torque-free polarization profiles of non- interacting particles. The activity waves induce fluxes that strongly depend on the particle size and may be employed to de-mix mixtures of ABPs or to drive the particles into selected areas of the system. Three-dimensional Langevin dynamics simulations are carried out to verify the accuracy of the linear response formalism, which is shown to work best when the particles are small (i.e., highly Brownian) or operating at low activity levels.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

Language