Exact results for deposition of binary mixtures of superdisks on the plane

Abstract

We investigate the deposition of binary mixtures of oriented superdisks on a plane. Superdisks are chosen as objects bounded by $|x{|}^{2p}+|y{|}^{2p}=1$, where parameter $p$ controls their size and shape. For single-type superdisks, the maximum packing and jamming densities are known to be nonanalytic at $p=0.5$. For binary mixtures, we discover that nonanalyticities form a locus of points separating "phase diagram" of shape combinations into regions with different excluded-area constructions. An analytical expression for this phase boundary and exact constructions of the excluded-areas are presented.