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As a result of nonequilibrium forces, purely repulsive self-propelledparticles undergo macrophase separation between a dense and a dilute phase. Wepresent a thorough study of the ordering kinetics of such motility-inducedphase separation (MIPS) in active Brownian particles in two dimensions, and weshow that it is generically accompanied by microphase separation. The growth ofthe dense phase follows a law akin to the one of liquid-gas phase separation.However, it is made of a mosaic of hexatic microdomains whose size does notcoarsen indefinitely, leaving behind a network of extended topological defectsfrom which microscopic dilute bubbles arise. The characteristic length of thesefinite-size structures increases with activity, independently of the choice ofinitial conditions.

Motility-Induced Microphase and Macrophase Separation in a Two-Dimensional Active Brownian Particle System