Electronic and atomic shell structure in aluminum nanowires

Details Electronic and atomic shell structure in aluminum nanowires Electronic and atomic shell structure in aluminum nanowires

2007-03-22

arxiv.org/abs/cond-mat/0703589v2

Nanotechnology 18, 265403 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

15 pages, 9 figures

Scientific paper

10.1088/0957-4484/18/26/265403

We report experiments on aluminum nanowires in ultra-high vacuum at room temperature that reveal a periodic spectrum of exceptionally stable structures. Two "magic" series of stable structures are observed: At low conductance, the formation of stable nanowires is governed by electronic shell effects whereas for larger contacts atomic packing dominates. The crossover between the two regimes is found to be smooth. A detailed comparison of the experimental results to a theoretical stability analysis indicates that while the main features of the observed electron-shell structure are similar to those of alkali and noble metals, a sequence of extremely stable wires plays a unique role in Aluminum. This series appears isolated in conductance histograms and can be attributed to "superdeformed" non-axisymmetric nanowires.

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