Lifetimes of image-potential states on copper surfaces

被引：163
|
作者：
Chulkov, EV
Sarria, I
Silkin, VM
Pitarke, JM
Echenique, PM
机构：
[1] Euskal Herriko Unibertsitatea, Kimika Fak, Donostia San Sebastian 20080, Basque Country, Spain
[2] Euskal Herriko Unibertsitaea, Zientzi Fak, Bilbao 48080, Basque Country, Spain
[3] Consejo Super Invest Cientif, Unidad Asociada, Inst Ciencia Mat, Madrid 28049, Spain
来源：
PHYSICAL REVIEW LETTERS | 1998年 / 80卷 / 22期
关键词：
D O I：
10.1103/PhysRevLett.80.4947
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The lifetime of image states, related to the coupling of surface electronic states with the solid substrate, has been recently determined for quantum numbers n less than or equal to 6 on Cu(100) by using time-resolved two-photon photoemission in combination with the coherent excitation of several states [U. Hofer et nl., Science 277, 1480 (1997)]. We evaluate the lifetimes of image states on copper surfaces from the self-energy of the excited quasiparticle, which we compute within the GW approximation. Single-particle wave functions are obtained by solving the Schrodinger equation with a realistic one-dimensional model potential, and the screened interaction is evaluated in the random-phase approximation. Our results are in agreement with experimentally determined decay times.
引用
收藏
页码：4947 / 4950
页数：4
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