Self-Doping of Gold Chains on Silicon: A New Structural Model for Si(111)5x2-Au

Details Self-Doping of Gold Chains on Silicon: A New Structural Model for Si(111)5x2-Au Self-Doping of Gold Chains on Silicon: A New Structural Model for Si(111)5x2-Au

2003-09-25

arxiv.org/abs/cond-mat/0309585v1

Phys. Rev. Lett. 91, 206101 (2003)

Physics

Condensed Matter

4 pages, 4 figures, to appear in Phys. Rev. Lett. (preprint with high quality figures available at http://cst-www.nrl.navy.m

Scientific paper

10.1103/PhysRevLett.91.206101

A new structural model for the Si(111)5x2-Au reconstruction is proposed and analyzed using first-principles calculations. The basic model consists of a "double honeycomb chain" decorated by Si adatoms. The 5x1 periodicity of the honeycomb chains is doubled by the presence of a half-occupied row of Si atoms that partially rebonds the chains. Additional adatoms supply electrons that dope the parent band structure and stabilize the period doubling; the optimal doping corresponds to one adatom per four 5x2 cells, in agreement with experiment. All the main features observed in scanning tunneling microscopy and photoemission are well reproduced.

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