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The purpose of this work is to use active particles to study the effect offacilitation on supercooled liquids. To this end we investigate the behavior ofa model supercooled liquid doped with intermittently active and intermittentlyslowed particles. To simulate a facilitation mechanism, the active particlesare submitted intermittently to a force following the mobility of the mostmobile molecule around, while the slowed particles are submitted to a frictionforce. We observe upon activation, a fluidization of the whole mediumsimultaneously to a large increase of the dynamic heterogeneity. This effect isreminiscent of the fluidization observed with molecular motors doping of themedium. When the mobility characteristic time used in the facilitationmechanism matches the physical time characterizing the spontaneous mobilityaggregation of the material, we observe a phase transition associated with astructural aggregation of active molecules. This transition is accompanied by asharp increase of the fluidization and dynamic heterogeneity.

Dynamic phase transition induced by active molecules simulating a facilitation mechanism in a supercooled liquid