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oai:docta.ucm.es:20.500.14352/68222023-08-26T23:16:29Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Martín Roca, José author Martínez, Raúl author Alexander, Lachlan C. author Díez, Ángel Luis author Aarts, Dirk G. A. L. author Alarcón, Francisco author Ramírez, Jorge author Valeriani, Chantal 2023-06-17T08:22:22Z 2023-06-17T08:22:22Z 2021-04-28 0021-9606 10.1063/5.0040141 https://hdl.handle.net/20.500.14352/6822 https://doi.org/10.1063/5.0040141 https://aip.scitation.org/ 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. eng Characterization of MIPS in a suspension of repulsive active Brownian particles through dynamical features journal article URL https://docta.ucm.es/bitstreams/e5d8d326-f64b-4a14-9e8c-5ed3aeff7208/download File MD5 724a061cb767dd1e01e891891d05c23d 4338199 application/pdf Valeriani14(emb.22-04-2022).pdf URL https://docta.ucm.es/bitstreams/badeca68-b206-4c07-8c73-4a9ceb8c36bf/download File MD5 f566773bfde2f7cbae828693ebe7a1b5 54937 text/plain Valeriani14(emb.22-04-2022).pdf.txt