Acoustic surface plasmons in the noble metals Cu, Ag, and Au

Details Acoustic surface plasmons in the noble metals Cu, Ag, and Au Acoustic surface plasmons in the noble metals Cu, Ag, and Au

2005-08-30

arxiv.org/abs/cond-mat/0508725v1

Physics

Condensed Matter

Materials Science

8 pages, two columns, 7 figures, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.72.115435

We have performed self-consistent calculations of the dynamical response of the (111) surface of the noble metals Cu, Ag, and Au. Our results indicate that the partially occupied surface-state band in these materials yields the existence of acoustic surface plasmons with linear dispersion at small wave vectors. Here we demonstrate that the sound velocity of these low-energy collective excitations, which had already been predicted to exist in the case of Be(0001), is dictated not only by the Fermi velocity of the two-dimensional surface-state band but also by the nature of the decay and penetration of the surface-state orbitals into the solid. Our linewidth calculations indicate that acoustic surface plasmons should be well defined in the energy range from zero to $\sim 400$ meV.

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