Dimensionality effects in the lifetime of surface states

被引:287
作者
Kliewer, J
Berndt, R [1 ]
Chulkov, EV
Silkin, VM
Echenique, PM
Crampin, S
机构
[1] Rhein Westfal TH Aachen, Inst Phys 2, D-52056 Aachen, Germany
[2] Univ Kiel, Inst Expt & Angew Phys, D-24098 Kiel, Germany
[3] Univ Basque Country, Fac Quim, Dept Fis Mat, E-20080 San Sebastian, Spain
[4] Univ Basque Country, CSIC, Ctr Mixto, E-20080 San Sebastian, Spain
[5] Donostia Int Phys Ctr, San Sebastian 20080, Spain
[6] Univ Bath, Dept Phys, Bath BA2 7AY, Avon, England
关键词
D O I
10.1126/science.288.5470.1399
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
A long-standing discrepancy between experimental and theoretical values for the lifetimes of holes in the surface-state electron bands on noble metal surfaces is resolved; previous determinations of both are found to have been in error. The ability of the scanning tunneling microscope to verify surface quality before taking spectroscopic measurements is used to remove the effects of defect scattering on experimental lifetimes, found to have been a significant contribution to prior determinations. A theoretical treatment of inelastic electron-electron scattering is developed that explicitly includes intraband transitions within the surface state band. In our model, two-dimensional decay channels dominate the electron-electron interactions that contribute to the hole decay and are screened by the electron states of the underlying three-dimensional electron system.
引用
收藏
页码:1399 / 1402
页数:4
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