Non-Crystalline Structures of Ultra-Thin Unsupported Nanowires
arXiv:cond-mat/9803096 · doi:10.1103/PhysRevLett.80.3775
Abstract
Computer simulations suggest that ultrathin metal wires should develop exotic, non-crystalline stable atomic structures, once their diameter decreases below a critical size of the order of a few atomic spacings. The new structures, whose details depend upon the material and the wire thickness, may be dominated by icosahedral packings. Helical, spiral-structured wires with multi-atom pitches are also predicted. The phenomenon, analogous to the appearance of icosahedral and other non-crystalline shapes in small clusters, can be rationalized in terms of surface energy anisotropy and optimal packing.
5 pages, 2 figures, REVTeX
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