Theory of acoustic surface plasmons

J. M. Pitarke*, V. U. Nazarov, V. M. Silkin, E. V. Chulkov, E. Zaremba, P. M. Echenique

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

Recently, a low-energy collective excitation has been predicted to exist at metal surfaces where a quasi two-dimensional (2D) surface-state band coexists with the underlying three-dimensional (3D) continuum. Here we present a model in which the screening of a semiinfinite 3D metal is incorporated into the description of electronic excitations in a 2D electron gas through the introduction of an effective 2D dielectric function. Our self-consistent calculations of the dynamical response of the 3D substrate indicate that an acoustic surface plasmon exists for all possible locations of the 2D sheet relative to the metal surface. This low-energy excitation, which exhibits linear dispersion at low wave vectors, is dictated by the nonlocality of the 3D dynamical response providing incomplete screening of the 2D electron-density oscillations.

Original languageAmerican English
Article number205403
Pages (from-to)205403-1-205403-12
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number20
DOIs
StatePublished - Nov 2004
Externally publishedYes

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