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Hough, L. E.,Jung, H. T.,Krü,erke, D.,Heberling, M. S.,Nakata, M.,Jones, C. D.,Chen, D.,Link, D. R.,Zasadzinski, J.,Heppke, G.,Rabe, J. P.,Stocker, W.,Kö,rblova, E.,Walba, D. M.,Glaser, M. A. American Association for the Advancement of Scienc 2009 Science Vol.325 No.5939
<P>In the formation of chiral crystals, the tendency for twist in the orientation of neighboring molecules is incompatible with ordering into a lattice: Twist is expelled from planar layers at the expense of local strain. We report the ordered state of a neat material in which a local chiral structure is expressed as twisted layers, a state made possible by spatial limitation of layering to a periodic array of nanoscale filaments. Although made of achiral molecules, the layers in these filaments are twisted and rigorously homochiral--a broken symmetry. The precise structural definition achieved in filament self-assembly enables collective organization into arrays in which an additional broken symmetry--the appearance of macroscopic coherence of the filament twist--produces a liquid crystal phase of helically precessing layers.</P>