Image resonance in the many-body density of states at a metal surface

Details Image resonance in the many-body density of states at a metal surface Image resonance in the many-body density of states at a metal surface

2003-05-29

arxiv.org/abs/cond-mat/0305678v1

Phys. Rev. B 68, 195404 (2003)

Physics

Condensed Matter

Materials Science

5 pages, 6 figures

Scientific paper

10.1103/PhysRevB.68.195404

The electronic properties of a semi-infinite metal surface without a bulk gap are studied by a formalism able to account for the continuous spectrum of the system. The density of states at the surface is calculated within the $GW$ approximation of many-body perturbation theory. We demonstrate the presence of an unoccupied surface resonance peaked at the position of the first image state. The resonance encompasses the whole Rydberg series of image states and cannot be resolved into individual peaks. Its origin is the shift in spectral weight when many-body correlation effects are taken into account.

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