Dynamics of activity-doped phase-separating binary mixtures

Phase separation is ubiquitous in physical systems across many fields of interest from metallurgy to biology. In recent years, phase separation in active matter has seen growing interest due to motility-induced phase separation and how activity can influence mixtures. It has been shown that activity can suppress phase separation in a binary mixture where one of the species is active (F. Caballero and M. C. Marchetti, PRL 129, 268022 (2022)) or arrest coarsening in a ternary system composed of a phase-separating binary mixture and an active species (J. Díaz and I. Pagonabarraga, PRL 134, 098301 (2025)). In this talk, we present molecular dynamics simulations of a passive phase-separating binary mixture with a dilute active dopant species. The dynamics are studied in detail to examine the out-of-equilibrium coarsening as well as steady-state morphologies not accessible in purely passive systems.