The role of surface plasmons in the decay of image-potential states on silver surfaces

Details The role of surface plasmons in the decay of image-potential states on silver surfaces The role of surface plasmons in the decay of image-potential states on silver surfaces

2002-07-18

arxiv.org/abs/cond-mat/0207444v1

Phys. Rev. Lett. 89, 096401 (2002)

Physics

Condensed Matter

Materials Science

4 pages, 2 figures, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.89.096401

The combined effect of single-particle and collective surface excitations in the decay of image-potential states on Ag surfaces is investigated, and the origin of the long-standing discrepancy between experimental measurements and previous theoretical predictions for the lifetime of these states is elucidated. Although surface-plasmon excitation had been expected to reduce the image-state lifetime, we demonstrate that the subtle combination of the spatial variation of s-d polarization in Ag and the characteristic non-locality of many-electron interactions near the surface yields surprisingly long image-state lifetimes, in agreement with experiment.

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