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Homogeneous active Brownian particle (ABP) systems with purely repulsiveinteractions are considered to have simple phase behavior, but various physicalattributes of active entities can lead to variation in the collective dynamics.Recent studies have shown that even homogeneous ABPs exhibit complex behaviordue to an interplay between particle softness and motility. However, theheterogeneity in composition of ABPs has not been explored yet. In this paper,we study the structural properties of a binary mixture of ABPs with differentparticle softness, by varying the relative softness and composition. We foundthat upon varying the motility parameter, the system underwent amotility-induced phase separation (MIPS) followed by a percolation transitionsimilar to the homogeneous systems; however, there is complex structureformation within the dense phase of the MIPS which depends on the relativesoftness of the binary system. Furthermore, the presence of a non-linearscaling for different compositions of heterogeneous ABPs suggests that there isa complex relationship between the composition and the structural properties.Our study demonstrates that the composition heterogeneity of ABPs can also leadto complex phase behavior.

Percolation transitions in the binary mixture of active Brownian particles with different softness