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Phase separation of active Brownian particles in two dimensions : anything for a quiet life

Title data

Hermann, Sophie ; de las Heras, Daniel ; Schmidt, Matthias:
Phase separation of active Brownian particles in two dimensions : anything for a quiet life.
In: Molecular Physics. Vol. 119 (2021) Issue 10 . - e1902585.
ISSN 1362-3028
DOI: https://doi.org/10.1080/00268976.2021.1902585

Project information

Project financing: Deutsche Forschungsgemeinschaft
DFG grant number 447925252

Abstract in another language

Active Brownian particles display self-propelled movement, which can be modelled as arising from a one-body force. Although their interparticle interactions are purely repulsive, for strong self-propulsion, the swimmers phase separate into dilute and dense phases. We describe in detail a recent theory for such motility induced phase-separation. Starting from the continuity equation and the force density balance, the description is based on four superadiabatic contributions to the internal force density. Here the superadiabatic forces are due to the flow in the system and they act on top of the adiabatic forces that arise from the equilibrium free energy. Phase coexistence is described by bulk state functions and agrees quantitatively with Brownian dynamics simulation results from the literature. We describe in detail all analytical steps to fully resolve the spatial and orientational dependence of the one-body density and current. The decomposition into angular Fourier series leads to coupling of total density, polarisation and all higher modes. We describe the power functional approach, including the kinematic dependence of the superadiabatic force fields and the quiet life effect that pushes particles from fast to slow regions and hence induces the phase separation.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics II
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics II > Chair Theoretical Physics II - Univ.-Prof. Dr. Matthias Schmidt
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 12 Aug 2021 08:09
Last Modified: 12 Aug 2021 08:09
URI: https://eref.uni-bayreuth.de/id/eprint/66783