Characterizing the Hyperuniformity of Ordered and Disordered Two-Phase Media

TL;DR

This paper investigates the hyperuniformity properties of two-dimensional ordered and disordered two-phase media, establishing a theoretical framework and identifying structures with minimal hyperuniformity order metrics.

Contribution

It introduces a method to classify hyperuniform two-phase media using local volume-fraction variances and hyperuniformity order metrics, focusing on complex geometries and topologies.

Findings

Honeycomb networks have minimal hyperuniformity order metric across volume fractions.

Triangular-lattice packings exhibit the smallest order metric among studied packings.

Triangular-lattice packing has minimal order metric for nearly all volume fractions.

Abstract

The hyperuniformity concept provides a unified means to classify all perfect crystals, perfect quasicrystals, and exotic amorphous states of matter according to their capacity to suppress large-scale density fluctuations. While the classification of hyperuniform point configurations has received considerable attention, much less is known about the classification of hyperuniform heterogeneous two-phase media, which include composites, porous media, foams, cellular solids, colloidal suspensions and polymer blends. The purpose of this article is to begin such a program for certain two-dimensional models of hyperuniform two-phase media by ascertaining their local volume-fraction variances $\sigma^2_{_V}(R)$ and the associated hyperuniformity order metrics $\overline{B}_V$. This is a highly challenging task because the geometries and topologies of the phases are generally much richer and more complex than point-configuration arrangements and one must ascertain a broadly applicable length scale to make key quantities dimensionless. Therefore, we focus on a certain class of two-dimensional periodic cellular networks, periodic and disordered/irregular packings, some of which maximize their effective transport and elastic properties. Among the cellular networks considered, the honeycomb networks have a minimal value of $\overline{B}_V$ across all volume fractions. On the other hand, among all packings considered, the triangular-lattice packings have the smallest values of $\overline{B}_V$ for the possible range of volume fractions. Among all structures studied here, the triangular-lattice packing has the minimal order metric for almost all volume fractions. Our study provides a theoretical foundation for the establishment of hyperuniformity order metrics for general two-phase media and a basis to discover new hyperuniform two-phase systems by inverse design procedures.