Toward the Jamming Threshold of Sphere Packings: Tunneled Crystals

Details Toward the Jamming Threshold of Sphere Packings: Tunneled Crystals Toward the Jamming Threshold of Sphere Packings: Tunneled Crystals

2007-07-28

arxiv.org/abs/0707.4263v1

Physics

Condensed Matter

Soft Condensed Matter

19 pages, 5 figures

Scientific paper

10.1063/1.2802184

We have discovered a new family of three-dimensional crystal sphere packings that are strictly jammed (i.e., mechanically stable) and yet possess an anomalously low density. This family constitutes an uncountably infinite number of crystal packings that are subpackings of the densest crystal packings and are characterized by a high concentration of self-avoiding "tunnels" (chains of vacancies) that permeate the structures. The fundamental geometric characteristics of these tunneled crystals command interest in their own right and are described here in some detail. These include the lattice vectors (that specify the packing configurations), coordination structure, Voronoi cells, and density fluctuations. The tunneled crystals are not only candidate structures for achieving the jamming threshold (lowest-density rigid packing), but may have substantially broader significance for condensed matter physics and materials science.

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