The nature and the dispersion of the electronic collective excitations in different metal bilayers (Na, Ca, Ag) deposited onto the Cu(111) surface were investigated by angle-resolved electron energy loss spectroscopy. We found a nearly-flat behavior of the surface plasmon energy (absence of dispersion) in Ca and Ag bilayers, characterized by the presence of d electrons, in good agreement with theoretical predictions within the framework of the s-d polarization model. On the contrary, an initial negative dispersion was observed in the Na bilayer. The intensity of the surface plasmon was vanishing in the long-wavelength limit in all cases. (C) 2009 Elsevier B.V. All rights reserved.
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Titolo: | Electronic properties of metallic bilayers deposited on Cu(111): A comparative study |
Autori: | |
Data di pubblicazione: | 2009 |
Rivista: | |
Handle: | http://hdl.handle.net/20.500.11770/152909 |
Appare nelle tipologie: | 1.1 Articolo in rivista |