Abstract
The quantum transport properties of ultrathin silver nanowires are investigated.For a perfect crystalline nanowire with four atoms per unit cell, three conductionchannels are found, corresponding to three s bands crossing the Fermi level. Oneconductance channel is disrupted by a single-atom defect, either adding orremoving one atom. The quantum interference effect leads to oscillation ofconductance versus the inter-defect distance. In the presence of a multiple-atomdefect, one conduction channel remains robust at the Fermi level regardless thedetails of defect configuration. The histogram of conductance calculated for afinite nanowire (seven atoms per cross section) with a large number ofrandom defect configurations agrees well with recent experiments.
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