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Type: 
Journal
Description: 
The nature and the dispersion of the electronic collective excitations in ultrathin Ag layers deposited onto the Cu (111) surface were investigated by angle-resolved high-resolution electron-energy-loss spectroscopy. For two Ag layers we found a nearly flat behavior of the surface-plasmon energy (absence of dispersion) as a function of the parallel momentum transfer. For higher coverages the surface plasmon is confined in Ag grains. The confinement of the surface plasmon was removed upon annealing. On the contrary, on the sputtered Ag film the quadratic term dominates.
Publisher: 
American Physical Society
Publication date: 
29 Jan 2009
Authors: 

A Politano, V Formoso, E Colavita, G Chiarello

Biblio References: 
Volume: 79 Issue: 4 Pages: 045426
Origin: 
Physical Review B