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Colloidal probes immersed in an active bath have been found to behave likeactive particles themselves. Here, we use coarse-grained simulations toinvestigate the mechanisms behind this behavior. We find that the active motionof the colloid cannot be simply attributed to the convective motion in thebath. Instead, the boundary of the probe contributes significantly to theseadopted dynamics by causing active bath particles to spontaneously accumulateat the probe. This gathering of active bath particles then pushes the probe,thus promoting its emergent active-particle-like behavior. Furthermore, we findthat the dynamic properties of the probe depend on its size in a non-monotonicway, which further highlights the non-trivial interplay between probe and bath.

How boundary interactions dominate emergent driving of passive probes in active matter