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An active system consisting of many self-spinning dimers is simulated, and adistinct local rotational jamming transition is observed as the densityincreases. In the low density regime, the system stays in an absorbing state,in which each dimer rotates independently subject to the applied torque. Whilein the high density regime, a fraction of the dimers become rotationally jammedinto local clusters, and the system exhibits spinodal-decomposition liketwo-phase morphologies. For high enough densities, the system becomescompletely jammed in both rotational and translational degrees of freedom. Sucha simple system is found to exhibit rich and multiscale disorderedhyperuniformities among the above phases: the absorbing state shows a criticalhyperuniformity of the strongest class and subcritically preserves thevanishing density-fluctuation scaling up to some length scale; thelocally-jammed state shows a two-phase hyperuniformity conversely beyond somelength scale with respect to the phase cluster sizes; the totally jammed stateappears to be a monomer crystal, but intrinsically loses large-scalehyperuniformity. These results are inspiring for designing novelphase-separation and disordered hyperuniform systems through dynamicalorganization.

Local Rotational Jamming and Multi-Scale Hyperuniformities in an Active Spinner System