Adsorption of Na on the GaAs(110) surface studied by the field-ion-scanning-tunneling-microscopyxs

Chunli Bai, Tomihiro Hashizume, Dong Ryul Jeon, Toshio Sakurai

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22 Citations (Scopus)

Abstract

The geometry and the coverage-dependent growth structures formed by Na deposition on the GaAs(110) surface at room temperature were studied using a field-ion scanning tunneling microscope. When the coverage is low, Na adatoms reside on the bridge site encompassing one Ga and two As surface atoms to form linear chains along the [1;;;;;;;0] direction. The Na-Na nearest-neighbor distance in this low-density chain structure is 8. At slightly increased coverage, the Na chains began to disorder. Some of them were packed closer to form domains showing a local 2 structure. None of high-density two dimensional ordered structures or low-density zigzag chains was observed, in contrast to the Cs/GaAs(110) system. Additional Na adsorption resulted in the formation of three-dimensional disordered clusters. The saturation coverage of Na was determined to be 0.1 ML (1 ML=2 Na per substrate unit cell).

Original languageEnglish
Pages (from-to)L1117-L1120
JournalJapanese journal of applied physics
Volume31
Issue number8
DOIs
Publication statusPublished - 1992 Aug
Externally publishedYes

Keywords

  • Alkali metal
  • Cesium
  • Fi-STM
  • Film growth
  • Gaas(110)
  • Sodium
  • Stm

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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