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Semiconducting chains of gold and silver
Appl. Phys. Lett. 91, 223115 (2007); DOI:10.1063/1.2820450

The authors introduce a geometry for ultrathin Au and Ag wires that ab initio calculations indicate to be more stable than previously considered planar geometries for these systems by about 0.1  eV per atom. This structure is insulating for both metals and for related Ag0.5Au0.5 alloys with gaps of 1.3  eV for Au, 0.8  eV for Ag, and varying between 0.1 and 1.9  eV for the alloys. The insulating nature of the geometry is not a result of Peierls instabilities and is analyzed in terms of an interplay between geometric and electronic structure effects. ©2007 American Institute of Physics

The insulating nature of the geometry
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