%0 Journal Article
%A Martín Roca, José
%A Martínez, Raúl
%A Alexander, Lachlan C.
%A Díez, Ángel Luis
%A Aarts, Dirk G. A. L.
%A Alarcón, Francisco
%A Ramírez, Jorge
%A Valeriani, Chantal
%T Characterization of MIPS in a suspension of repulsive active Brownian particles through dynamical features
%D 2021
%@ 0021-9606
%U https://hdl.handle.net/20.500.14352/6822
%X 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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