We perform large-scale computer simulations of an off-lattice two-dimensional model of active particles undergoing a motility-induced phase separation (MIPS) to investigate the system's critical behaviour close to the critical point of the MIPS curve. By sampling steady-state configurations for large system sizes and performing finite size scaling analysis we provide exhaustive evidence that the critical behaviour of this active system belongs to the Ising universality class. In addition to the scaling observables that are also typical of passive systems, we study the critical behaviour of the kinetic temperature difference between the two active phases. This quantity, which is always zero in equilibrium, displays instead a critical behavior in the active system which is well described by the same exponent of the order parameter in agreement with mean-field theory.

Universality class of the motility-induced critical point in large scale off-lattice simulations of active particles / Maggi, C.; Paoluzzi, M.; Crisanti, A.; Zaccarelli, E.; Gnan, N.. - In: SOFT MATTER. - ISSN 1744-683X. - 17:14(2021), pp. 3807-3812. [10.1039/d0sm02162h]

Universality class of the motility-induced critical point in large scale off-lattice simulations of active particles

Maggi C.;Paoluzzi M.;Crisanti A.;Zaccarelli E.;Gnan N.
2021

Abstract

We perform large-scale computer simulations of an off-lattice two-dimensional model of active particles undergoing a motility-induced phase separation (MIPS) to investigate the system's critical behaviour close to the critical point of the MIPS curve. By sampling steady-state configurations for large system sizes and performing finite size scaling analysis we provide exhaustive evidence that the critical behaviour of this active system belongs to the Ising universality class. In addition to the scaling observables that are also typical of passive systems, we study the critical behaviour of the kinetic temperature difference between the two active phases. This quantity, which is always zero in equilibrium, displays instead a critical behavior in the active system which is well described by the same exponent of the order parameter in agreement with mean-field theory.
2021
soft matter; active matter; critical phenomena
01 Pubblicazione su rivista::01a Articolo in rivista
Universality class of the motility-induced critical point in large scale off-lattice simulations of active particles / Maggi, C.; Paoluzzi, M.; Crisanti, A.; Zaccarelli, E.; Gnan, N.. - In: SOFT MATTER. - ISSN 1744-683X. - 17:14(2021), pp. 3807-3812. [10.1039/d0sm02162h]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1575794
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