Universality class of the motility-induced critical point in large scale off-lattice simulations of active particles. Issue 14 (1st March 2021)

• Record Type: Journal Article
• Authors: Maggi, Claudio; Paoluzzi, Matteo; Crisanti, Andrea; Zaccarelli, Emanuela; Gnan, Nicoletta
• Is Part Of: Soft matter. Volume 17:Issue 14(2021)
• Page Start: 3807
• Page End: 3812
• Publication Date: 2021-03-01
• Subjects: Soft condensed matter -- Periodicals; 530.413
• DOI: 10.1039/d0sm02162h
• Languages: English
• ISSNs: 1744-683X

Abstract

Abstract : Performing large-scale simulations of active particles and employing finite-size-scaling analysis, we provide exhaustive evidence that motility-induced critical point belongs to the Ising universality class. 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.