The electronic properties of a semi-infinite metal surface without a bulk gap are studied by a formalism that is 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.
|Number of pages||5|
|Journal||Physical Review B|
|Publication status||Published - Nov 2003|
Bibliographical note© 2003 American Physical Society. This is an author produced version of a paper published in Physical Review B. Uploaded in accordance with the publisher's self archiving policy.
- POTENTIAL-INDUCED RESONANCES
- 2-PHOTON PHOTOEMISSION
- INVERSE PHOTOEMISSION