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We study experimentally a sediment of self-propelled Brownian particles withdensities ranging from dilute to ergodic supercooled, to nonergodic glass, tononergodic polycrystal. In a compagnon letter, we observe a nonmonotonicresponse to activity of relaxation of the nonergodic glass state: a dramaticslowdown when particles become weakly self-propelled, followed by a speedup athigher activities. Here we map ergodic supercooled states to standard passiveglassy physics, provided a monotonic shift of the glass packing fraction andthe replacement of the ambient temperature by the effective temperature.However we show that this mapping fails beyond glass transition. This failureis responsible for the nonmonotonic response. Furthermore, we generalize ourfinding by examining the dynamical response of an other class of nonergodicsystems : polycrystals. We observe the same nonmonotinic response to activity.To explain this phenomenon, we measure the size of domains were particles movein the same direction. This size also shows a nonmonotonic response, with smalllengths corresponding to slow relaxation. This suggests that the failure of themapping of nonergodic active states to a passive situation is general and islinked to anisotropic relaxation mechanisms specific to active matter.

Nonmonotonic behavior in the dense assemblies of active colloids