DO WE KNOW THE TRUE STRUCTURE OF GE(111)C(2X8)

被引：99

作者：

TAKEUCHI, N

SELLONI, A

TOSATTI, E

机构：

[1] INT CTR THEORET PHYS, I-34014 TRIESTE, ITALY

[2] UNIV GENEVA, DEPT PHYS CHEM, CH-1211 GENEVA 4, SWITZERLAND

来源：

PHYSICAL REVIEW LETTERS | 1992年 / 69卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.69.648

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present the first ab initio determination of the surface structure and electronic properties of Ge(111)c(2x8). New features emerge, in addition to the basic adatom-rest-atom architecture. In agreement with LEED, which shows weak but nonvanishing quarter-order reflections, we find that an asymmetry is present in the surface unit cell, related to a small buckling between the two rest atoms, as well as to in-plane asymmetries of the rest atoms, adatoms, and first bilayer atoms. This inequivalence also produces a splitting of both the rest-atom and the adatom dangling-bond states, which explains the difference in their apparent heights as seen recently with scanning tunneling microscopy.

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页码：648 / 651

页数：4

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