Step-by-step cooling of a two-dimensional Na gas on the Si(111)-(7 X 7) surface

K. H. Wu, A. I. Oreshkin, Y. Takamura, Y. Fujikawa, T. Nagao, T. Briere, V. Kumar, Y. Kawazoe, R. F. Dou, J. F. Jia, Q. K. Xue, T. Sakurai

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


We report a temperature-dependent scanning tunneling microscopy study of Na adsorption on the Si(111)-(7 X 7) surface by cooling the surface from room temperature to 80 K. While at room temperature Na atoms can diffuse freely on the surface to form a two-dimensional gas, their motion is confined within the 7 X 7 half-unit cells at 160 K. With further cooling to 80 K, Na atoms become localized within individual "basins." The estimated diffusion barriers of Na atoms on the Si(111)-(7 X 7) surface and nature of interaction among them agree well with our theoretical predictions.

Original languageEnglish
Article number195417
Pages (from-to)1-4
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number19
Publication statusPublished - 2004 Nov
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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