Alkali metal chains on the GaAs(110) surface
作者:
Inder P. Batra,
C. Y. Fong,
期刊:
Journal of Vacuum Science&Technology A: Vacuum, Surfaces, and Films
(AIP Available online 1991)
卷期:
Volume 9,
issue 3
页码: 1962-1963
ISSN:0734-2101
年代: 1991
DOI:10.1116/1.577436
出版商: American Vacuum Society
关键词: GALLIUM ARSENIDES;LINEAR CHAINS;ADSORPTION;ALKALI METALS;BAND STRUCTURE;SORPTIVE PROPERTIES;GaAs
数据来源: AIP
摘要:
It has been reported that Cs adsorbed at low coverages on GaAs(110) forms linear one‐dimensional chains which usually appeared in pairs. The alkali metal atoms in the two chains (called primary and secondary) are shifted along the [11̄0] direction by an amounta/√2, whereais the bulk cubic lattice constant of GaAs. It is an unresolved issue as to why the chains appear in pairs adjacent to each other. We suggest that the primary and secondary chains can be really viewed as a single chain with a zig–zag structure. One can then compare the calculated total energy for a single linear chain (of double the density) with the total energy for a zig–zag chain. The latter is found to be a lower energy structure in agreement with the scanning tunneling microscopy observations. Physical interactions responsible for stabilizing the zig–zag structure are briefly discussed.
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