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Using computer simulations we explore how grain boundaries can be removedfrom three-dimensional colloidal crystals by doping with a small fraction ofactive colloids. We show that for sufficient self-propulsion, the system isdriven into a crystal-fluid coexistence. In this phase separated regime, theactive dopants become mobile and spontaneously gather at the grain boundaries.The resulting surface melting and recrystallization of domains result in themotion of the grain boundaries over time and lead to the formation of a largesingle crystal. However, when the self-propulsion is too low to cause a phaseseparation, we observe no significant enhancement of grain growth.

Removing grain boundaries from three-dimensional colloidal crystals using active dopants