Electronic structure and stability of ring clusters in the Si(111)-(√7×√7)Co surface
Electronic structure and stability of ring clusters in the Si(111)-(√7×√7)Co surface
复制标题
Si(111)-(√7×√7)Co表面环团的电子结构和稳定性
DOI:
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发表时间:
1993
期刊:
影响因子:
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通讯作者:
D. Cahill
中科院分区:
文献类型:
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作者:
M. Tsai;J. Dow;P. Bennett;D. Cahill
The ring-cluster structure of the Si(111)-(√7×√7)Co surface is investigated by comparing local-density approximation, spin-dependent pseudofunction theoretical results with data. In the ring-cluster model, each surface unit cell contains a single Co atom substituting for a Si surface atom; this Co atom is then covered by three «bridging» and three «capping» Si adatoms, yielding C 3 point-group symmetry with respect to the Co site. We confirm the energetic stability of the ring-cluster structure, and determine atomic coordinates, including the height, 0.46 A, that the Co atom lies above the surface plane