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Photoemission Beyond the Sudden Approximation

Carl-Olof Almbladh
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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 peak.

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Carl-Olof Almbladh. 2005-12-05. Photoemission Beyond the Sudden Approximation. https://doi.org/10.1088/1742-6596%2F35%2F1%2F011

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