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Title: The stability phase diagram of active Brownian particles
Authors: Nie, Pin
Chattoraj, Joyjit
Piscitelli, Antonio
Doyle, Patrick
Ni, Ran
Pica Ciamarra, Massimo
Keywords: Science::Physics
Issue Date: 2020
Source: Nie, P., Chattoraj, J., Piscitelli, A., Doyle, P., Ni, R., & Pica Ciamarra, M. (2020). Stability phase diagram of active Brownian particles. Physical Review Research, 2(2), 023010-. doi:10.1103/PhysRevResearch.2.023010
Journal: Physical Review Research
Abstract: Phase separation in a low-density gas-like phase and a high-density liquid-like one is a common trait of biological and synthetic self-propelling particle systems. The competition between motility and stochastic forces is assumed to fix the boundary between the homogeneous and the phase-separated phase. Here we demonstrate that, on the contrary, motility does also promote the homogeneous phase allowing particles to resolve their collisions. This understanding allows quantitatively predicting the spinodal line of hard self-propelling Brownian particles, the prototypical model exhibiting a motility-induced phase separation. Furthermore, we demonstrate that frictional forces control the physical process by which motility promotes the homogeneous phase. Hence, friction emerges as an experimentally variable parameter to control the motility-induced phase diagram.
ISSN: 2643-1564
DOI: 10.1103/PhysRevResearch.2.023010
Schools: School of Chemical and Biomedical Engineering 
School of Physical and Mathematical Sciences 
Rights: © 2020 The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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