Electron-phonon interaction at the Si(111)-7x7 surface

被引：27

作者：

Barke, I. ^{[1
]}

Zheng, Fan ^{[1
]}

Konicek, A. R. ^{[1
]}

Hatch, R. C. ^{[1
]}

Himpsel, F. J. ^{[1
]}

机构：

[1] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.96.216801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

It is shown that electron-phonon interaction provides a natural explanation for the unusual band dispersion of the metallic surface states at the Si(111)-(7x7) surface. Angle-resolved photoemission reveals a discontinuity of the adatom band at a binding energy close to the dominant surface phonon mode at h omega(0)=70 meV. This mode has been assigned to adatom vibrations by molecular dynamics calculations. A calculation of the spectral function for electron-phonon interaction with this well-defined Einstein mode matches the data. Two independent determinations of the electron-phonon coupling parameter from the band dispersion and from the temperature-dependent phonon broadening yield similar values of lambda=1.09 and lambda=1.06.

引用

页数：4

共 22 条

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