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Spinner mixtures consisting of both clockwise and counterclockwiseself-spinning particles are often expected to phase separate. However, wedemonstrate that such a demixing is absent for dimer (or rod-like) spinners.These particles always mix, even in a globally-hyperuniform way, with the totalstructure factor $S(q\to 0)\sim q^{\alpha}\,(\alpha>0)$. This globalhyperuniformity can be enhanced or weakened by changes in the driving torquesor the particle density in various ways. The corresponding microscopicmechanism is attributed to the competition between a dynamicalheterocoordination effect and effective like-particle attractions. Criticalscaling for the absorbing state transition of the system is also found topersist, with a significant shift in its critical point observed. The systemcan be further thermalized, by the driving torques or through thermostating,into an ideal solution with identical partial radial distribution functions,which denys the possibility of being multi-hyperuniform. A simply-extentedcoupled density-oscillator theory explains why the system can not bemulti-hyperuniform, but can have a global hyperuniformity with the scalingexponent $\alpha$ approaching $2$. Such a hyperuniform mixing provides a way toregulate the topological boundary flows of this chiral system, and this mixingregulation is found to barely affect the bulk density fluctuations and evenpreserve the localization of the flows and the bulk hyperuniformity.

Hyperuniform Mixing of Binary Active Spinners