Structure of double row quantum wires in Au/Si(5 5 3)

S. K. Ghose, I. K. Robinson, Peter Bennett, F. J. Himpsel

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

We present a new structure for the quantum-wire surface Au/Si(5 5 3) obtained from three-dimensional X-ray diffraction measurements. We have found the structure has double row of gold, so the wires are two atoms thick. The diffraction pattern is 1 × 1 implying a simple (CTR-only) structure, but disorder is necessary in the model to get a good fit, in the form of a 50-50 splitting of the position of one of the gold sites. A 50% occupied Si adatom is also found, which is a common structural theme of Si(1 1 1) vicinal surfaces. Since there are insufficient available bonds for an adatom to reside in every unit cell, the Au splitting can be seen as a consequence of the alternating presence of the adatoms. No half order diffraction was observed, so any local order of these features must be assumed to be short-range.

Original languageEnglish (US)
Pages (from-to)199-206
Number of pages8
JournalSurface Science
Volume581
Issue number2-3
DOIs
StatePublished - May 1 2005

Keywords

  • Faceting
  • Gold
  • Self-assembly
  • Silicon
  • Surface structure
  • Vicinal single crystal surfaces
  • X-ray diffraction

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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