Volume 66, Number 2, April 2004
|Page(s)||260 - 264|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 April 2004|
Novel low-energy collective excitation at metal surfaces
Donostia International Physics Center (DIPC) and Centro Mixto CSIC-UPV/EHU Manuel de Lardizabal Pasealekua, E-20018 Donostia, Basque Country, Spain
2 Materia Kondentsatuaren Fisika Saila, Zientzi Fakultatea Euskal Herriko Unibertsitatea - 644 Posta kutxatila E-48080 Bilbo, Basque Country, Spain
3 Materialen Fisika Saila, Kimika Fakultatea, Euskal Herriko Unibertsitatea 1072 Posta kutxatila, E-20018 Donostia, Basque Country, Spain
4 Department of Physics, Queen's University - Kingston, Ontario, Canada K7L 3N6
Accepted: 11 February 2004
A novel collective excitation is predicted to exist at metal surfaces where a two-dimensional surface state band coexists with the underlying three-dimensional continuum. This is a low-energy acoustic plasmon with linear dispersion at small wave vectors. Since new modern spectroscopies are especially sensitive to surface dynamics near the Fermi level, the existence of surface-state–induced acoustic plasmons is expected to play a key role in a large variety of new phenomena and to create situations with potentially new physics.
PACS: 71.45.Gm – Exchange, correlation, dielectric and magnetic response functions, plasmons / 73.20.At – Surface states, band structure, electron density of states / 73.50.Gr – Charge carriers: generation, recombination, lifetime, trapping, mean free paths
© EDP Sciences, 2004
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