American Physical Society, Physical Review Letters, 8(92), 2004
DOI: 10.1103/physrevlett.92.089902
American Physical Society, Physical Review Letters, 17(90), 2003
DOI: 10.1103/physrevlett.90.176805
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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.