RT Journal Article
T1 Characterization of MIPS in a suspension of repulsive active Brownian particles through dynamical features
A1 Martín Roca, José
A1 Martínez, Raúl
A1 Alexander, Lachlan C.
A1 Díez, Ángel Luis
A1 Aarts, Dirk G. A. L.
A1 Alarcón, Francisco
A1 Ramírez, Jorge
A1 Valeriani, Chantal
AB 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.
PB American  Institute of Physics
SN 0021-9606
YR 2021
FD 2021-04-28
LK https://hdl.handle.net/20.500.14352/6822
UL https://hdl.handle.net/20.500.14352/6822
LA eng
NO 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.
NO Ministerio de Economía y Competitividad (MINECO)
NO Ministerio de Ciencia e Innovación (MICINN)
NO Universidad Complutense de Madrid/Banco de Santander
NO Red Española de Supercomputación (RES)
DS Docta Complutense
RD 6 abr 2025