Photoemission Beyond the Sudden Approximation

Details Photoemission Beyond the Sudden Approximation Photoemission Beyond the Sudden Approximation

2005-12-05

arxiv.org/abs/cond-mat/0512071v1

Physics

Condensed Matter

Other Condensed Matter

18 pages, 11 figures

Scientific paper

10.1088/1742-6596/35/1/011

The many-body theory of photoemission in solids is reviewed with emphasis on methods based on response theory. The classification of diagrams into loss and no-loss diagrams is discussed and related to Keldysh path-ordering book-keeping. Some new results on energy losses in valence-electron photoemission from free-electron-like metal surfaces are presented. A way to group diagrams is presented in which spectral intensities acquire a Golden-Rule-like form which guarantees positiveness. This way of regrouping should be useful also in other problems involving spectral intensities, such as the problem of improving the one-electron spectral function away from the quasiparticle peak.

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