Publication: Characterization of MIPS in a suspension of repulsive active Brownian particles through dynamical features
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2021-04-28
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American Institute of Physics
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Abstract
We study a two-dimensional system composed by Active Brownian Particles (ABPs), focusing on the onset of Motility Induced Phase Separation (MIPS), by means of molecular dynamics simulations. For a pure hard-disk system with no translational diffusion, the phase diagram would be completely determined by their density and Peclet number. In our model, two additional effects are present: translational noise and the overlap of particles; we study the effects of both in the phase space. As we show, the second effect can be mitigated if we use, instead of the standard Weeks-Chandler-Andersen potential, a stiffer potential: the pseudo-hard sphere potential. Moreover, in determining the boundary of our phase space, we explore different approaches to detect MIPS and conclude that observing dynamical features, via the non-Gaussian parameter, is more efficient than observing structural ones, such as through the local density distribution function. We also demonstrate that the Vogel-Fulcher equation successfully reproduces the decay of the diffusion as a function of density, with the exception of very high densities. Thus, in this regard, the ABP system behaves similar to a fragile glass.
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The authors acknowledge funding from the MINECO and the UCM/Santander PR26/16-10B-2 under Grant Nos. FIS2016-78847-P and ID2019-105343GB-I00, respectively. F.A. acknowledges support from the "Juan de la Cierva" program (No. FJCI-2017-33580). R.M. acknowledges funding from the MICINN (Ministerio de Ciencia e Innovacion, Spain, FPI Grant No. BES-2017-081108). The authors acknowledge the computer resources and technical assistance provided by the Centro de Supercomputacion y Visualización de Madrid (CeSViMa) and the Red Española de Supercomputación (RES, Grant Nos. FI-2020-1-0015 and FI-2020-2-0032). There are no conflicts to declare.