Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9594037 | Progress in Surface Science | 2005 | 23 Pages |
Abstract
Using low-temperature scanning tunnelling microscopy and spectroscopy we have studied the dynamics of surface state electrons confined to vacancy islands on Ag(1Â 1Â 1) and localised at single magnetic and non-magnetic atoms adsorbed on Ag(1Â 1Â 1) and Cu(1Â 1Â 1). The line width of confined electronic states is found to be only weakly affected by the actual geometry of the vacancy island. A corresponding model shows that lossy boundary scattering is the dominant lifetime-limiting process in the vacancies studied. We present a corrected analysis of the spatial decay of electron interference patterns, leading to a more consistent description of the Ag(1Â 1Â 1) surface state lifetime than was previously the case. A scanning tunnelling spectroscopy study of single adsorbed atoms is presented. By means of an extended Newns-Anderson model an observed resonance is interpreted in terms of an adsorbate-induced bound state split off from the bottom of the surface-state band. A preliminary line shape analysis of the bound state indicates that adsorbed atoms can modify the surface-state lifetime.
Related Topics
Physical Sciences and Engineering
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Physical and Theoretical Chemistry
Authors
J. Kröger, L. Limot, H. Jensen, R. Berndt, S. Crampin, E. Pehlke,