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

    Research output: Contribution to journalArticlepeer-review

    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

    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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