Novel low-energy collective excitation at metal surfaces

V. M. Silkin; A. García-Lekue; J. M. Pitarke; E. V. Chulkov; E. Zaremba; P. M. Echenique

doi:10.1209/epl/i2003-10184-1

All issues

Volume 66 / No 2 (April 2004)

Europhys. Lett., 66 2 (2004) 260-264

Abstract

Issue		Europhys. Lett. Volume 66, Number 2, April 2004


Page(s)		260 - 264
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2003-10184-1
Published online		01 April 2004

Europhys. Lett., 66 (2), pp. 260-264 (2004)

Novel low-energy collective excitation at metal surfaces

V. M. Silkin¹, A. García-Lekue², J. M. Pitarke¹^,2, E. V. Chulkov¹^,3, E. Zaremba⁴ and P. M. Echenique¹^,3

¹ 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

Received: 19 November 2003
Accepted: 11 February 2004

Abstract

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

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