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    Online Resource
    Online Resource
    American Vacuum Society ; 1993
    In:  Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films Vol. 11, No. 3 ( 1993-05-01), p. 525-528
    In: Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, American Vacuum Society, Vol. 11, No. 3 ( 1993-05-01), p. 525-528
    Abstract: This article reports structural and electronic properties of sodium adsorbed on room-temperature GaAs(110) surface as observed with scanning tunneling microscopy in an ultrahigh vacuum. In the low-coverage regime, Na adatoms reside on the bridge site encompassing one Ga and two As surface atoms to form linear chains along the [11̄0] direction. The Na–Na nearest-neighbor distance in this low-density chain structure is 8 Å. When the Na coverage was increased to ∼0.09 ML (1 ML≡2 Na per substrate unit cell), the chains became slightly disordered. Some of them were packed closer to form domains with local 2×2 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 adsorption on the GaAs(110) surface was determined to be ∼0.1 ML. No evidence of metallic characteristics was found in the I–V curves recorded over the various Na-covered surfaces.
    Type of Medium: Online Resource
    ISSN: 0734-2101 , 1520-8559
    RVK:
    Language: English
    Publisher: American Vacuum Society
    Publication Date: 1993
    detail.hit.zdb_id: 1475424-1
    detail.hit.zdb_id: 797704-9
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