paper

Screw symmetry in columnar crystals

arXiv:1306.2883 · doi:10.1080/14786435.2013.817691

Abstract

We show that the optimal packing of hard spheres in an infinitely long cylinder yields structures characterised by a screw symmetry. Each packing can be assembled by stacking a basic unit cell ad infinitum along the length of the cylinder with each subsequent unit cell rotated by the same twist angle with respect to the previous one. In this paper we quantitatively describe the nature of this screw operation for all such packings in the range 1 <= D/d <= 2.715 and also briefly discuss their helicity.

Accepted for publication by philosophical magazine for a special conference issue as part of the "international workshop on packing problems". See http://www.tcd.ie/Physics/Foams/PackingProblems/workshop.php

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