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Phys Rev Lett. 2003 May 2;90(17):176805. Epub 2003 May 2.

Fractional band filling in an atomic chain structure.

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  • 1Department of Physics, UW-Madison, 1150 University Avenue, Madison, Wisconsin 53706, USA.

Erratum in

  • Phys Rev Lett. 2004 Feb 27;92(8):089903.


A new chain structure of Au is found on stepped Si(111) which exhibits a 1/4-filled band and a pair of > or =1/2-filled bands with a combined filling of 4/3. Band dispersions and Fermi surfaces for Si(553)-Au are obtained by photoemission and compared to that of Si(557)-Au. The dimensionality of both systems is determined using a tight binding fit. The fractional band filling makes it possible to preserve metallicity in the presence of strong correlations.

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