Novel low-energy collective excitation at metal surfaces

Details Novel low-energy collective excitation at metal surfaces Novel low-energy collective excitation at metal surfaces

2004-02-10

arxiv.org/abs/cond-mat/0402273v1

Europhys. Lett. 66, 260 (2004)

Physics

Condensed Matter

Materials Science

6 pages, 3 figures, to appear in Europhys. Lett

Scientific paper

10.1209/epl/i2003-10184-1

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.

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