Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2001-06-13
"Electronic Correlations: from meso- to nano-physics", ed. by T.Martin, G. Montambaux, and J. Tran Thanh Van (EDP Sciences, Le
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 1 figure, to be published in the proceedings of the XXXVI Rencontres de Moriond
Scientific paper
Experimental conductance histograms built from several thousand successive breakings of sodium nanowires exhibit peaks up to rather high conductance values (100 x 2e^2/h). In this paper, we present results from a disordered free-electron model of a metallic nanowire, which was previously successful in describing both conductance histograms and shot noise measurements in gold nanocontacts with much lower conductances. We find in particular that, with a modification of the model of disorder, the conductance histogram can be understood as an interplay of conductance quantization and disorder for low conductances (G < 10 x 2e^2/h), while peaks corresponding to higher conductance are actually a combination of several ``quantized conductance peaks''. We also predict a saturation of the shot noise at high conductance to about 1/10 of its classical value 2eI.
Bürki J.
Stafford Charles A.
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