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Paper   IPM / Physic / 16415
School of Physics
  Title:   Effective interactions mediated between two permeable disks in an active fluid
1.  M. Sebtosheikh
2.  A. Naji
  Status:   Published
  Journal: Scientific Reports
  Vol.:  10
  Year:  2020
  Pages:   15570
  Supported by:  IPM
We study steady-state properties of a bath of active Brownian particles (ABPs) in two dimensions in the presence of two fixed, permeable (hollow) disklike inclusions, whose interior and exterior regions can exhibit mismatching motility (self-propulsion) strengths for the ABPs. We show that such a discontinuous motility field strongly affects spatial distribution of ABPs and thus also the effective interaction mediated between the inclusions through the active bath. Such net interactions arise from soft interfacial repulsions between ABPs that sterically interact with and/or pass through permeable membranes assumed to enclose the inclusions. Both regimes of repulsion and attractive (albeit with different mechanisms) are reported and summarized in overall phase diagrams.

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