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
Language:
English
Publisher:
American Vacuum Society
Publication Date:
1993
detail.hit.zdb_id:
1475424-1
detail.hit.zdb_id:
797704-9