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Photoemission beyond the sudden approximation
Abstract
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 pea- contributiontobookanthology/conference
- info:eu-repo/semantics/conferencePaper
- text
- Condensed Matter Physics
- many-body theory
- energy losses
- valence-electron photoemission
- free-electron-like metal surfaces
- one-electron spectral function
- nonequilibrium Green's functions
- quasiparticle peak
- photoemission spectroscopy