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Published Online August 22, 2002
Science DOI: 10.1126/science.1075242

Reports

Submitted on June 19, 2002
Accepted on August 6, 2002

Development of One-Dimensional Band Structure in Artificial Gold Chains

N. Nilius 1, T. M. Wallis 2, W. Ho 1*

1 Department of Physics and Astronomy and Department of Chemistry, University of California, Irvine, CA 92697-4575, USA.
2 Department of Physics and Astronomy and Department of Chemistry, University of California, Irvine, CA 92697-4575, USA; Department of Physics, Cornell University, Ithaca, NY 14853-2501, USA.

* To whom correspondence should be addressed. E-mail: wilsonho{at}uci.edu.

The ability of a scanning tunneling microscope to manipulate single atoms is used to build well-defined gold chains on NiAl(110). The electronic properties of the one-dimensional chains are dominated by an unoccupied electron band, gradually developing from a single atomic orbital present in a gold atom. Spatially resolved conductance measurements along a 20-atom chain provide the dispersion relation, effective mass, and density of states of the free-electron-like band. These experiments demonstrate a new strategy for probing the interrelation between geometric structure, elemental composition, and electronic properties in metallic nanostructures.


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