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- W2950526954 abstract "We study a system of interacting active particles, propelled by colored noises, characterized by an activity time {tau}, and confined by a single-well anharmonic potential. We assume pair-wise repulsive forces among particles, modelling the steric interactions among microswimmers. This system has been experimentally studied in the case of a dilute suspension of Janus particles confined through acoustic traps. We observe that already in the dilute regime - when inter-particle interactions are negligible - increasing the persistent time pushes the particles away from the potential minimum, until a saturation distance is reached. We compute the phase diagram (activity versus interaction length), showing that the interaction does not suppress this delocalization phenomenon but induces a liquid- or solid-like structure in the densest regions. Interestingly a reentrant behavior is observed: a first increase of {tau} from small values acts as an effective warming, favouring fluidization; at higher values, when the delocalization occurs, a further increase of {tau} induces freezing inside the densest regions. An approximate analytical scheme gives fair predictions for the density profiles in the weakly interacting case. The analysis of non-equilibrium heat fluxes reveals that in the region of largest particle concentration equilibrium is restored in several aspects." @default.
- W2950526954 created "2019-06-27" @default.
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- W2950526954 date "2018-10-30" @default.
- W2950526954 modified "2023-10-03" @default.
- W2950526954 title "Activity induced delocalization and freezing in self-propelled systems" @default.
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