Designing tunable hyperuniformity in random organization through nonlocal noise

Abstract

Hyperuniform fluids suppress density fluctuations at large length scales, but microscopic protocols for designing their asymptotic scaling remain limited. Here we show how effective driving noise generated by particle dynamics can select the hyperuniform exponent while preserving ordinary diffusion and pairwise center-of-mass conservation of the organized particles. We establish this connection through two protocols based on biased random organization (BRO). First, a two-dimensional BRO layer is nonreciprocally coupled to a three-dimensional Brownian gas through density-dependent kick amplitudes. Bulk density fluctuations generate spatially nonlocal noise with a $q^3$ power spectrum in the adiabatic limit, producing $S(q\to0)\sim q^1$. Second, we introduce reciprocal kicks whose lengths follow a Pareto-like distribution, $P(\ell)\sim\ell^{-1-b}$. For $2<b<4$, the finite second moment supports ordinary diffusion, while the divergent fourth moment changes the long-wavelength noise spectrum to $q^b$. The corresponding fluctuating density field theory predicts continuously tunable hyperuniform scaling, $S(q\to0)\sim q^{b-2}$, supported by particle simulations. Together, these results connect targeted hyperuniform scaling to explicit microscopic dynamics and provide a physical basis for designing collective density correlations in nonequilibrium particle systems.