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Electronic properties of metallic bilayers deposited on Cu(1 1 1): A comparative study |
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| Authors: | Antonio Politano Vincenzo Formoso Gennaro Chiarello |
| Affiliation: | a Dipartimento di Fisica, Università degli Studi della Calabria, Via Ponte Bucci, 2 Cubo 31/C, 87036 Rende (Cs), Italy b Laboratorio regionale LICRYL, INFM-CNR, Università degli Studi della Calabria, 87036 Rende (Cs), Italy c CNISM, Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Università degli Studi della Calabria, 87036 Rende (Cs), Italy |
| Abstract: | The nature and the dispersion of the electronic collective excitations in different metal bilayers (Na, Ca, Ag) deposited onto the Cu(1 1 1) 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. |
| Keywords: | Electron energy loss spectroscopy (EELS) Plasmons Alkali metals Alkaline earth metals Silver |
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