Why is the bandwidth of sodium observed to be narrower in photoemission experiments?

Details Why is the bandwidth of sodium observed to be narrower in photoemission experiments? Why is the bandwidth of sodium observed to be narrower in photoemission experiments?

1999-05-18

arxiv.org/abs/cond-mat/9905250v1

Physics

Condensed Matter

Materials Science

9 pages

Scientific paper

10.1103/PhysRevLett.83.3250

The experimentally predicted narrowing in the bandwidth of sodium is interpreted in terms of the non-local self-energy effect on quasi-particle energies of the electron liquid. The calculated self-energy correction is a monotonically increasing function of the wavenumber variable. The usual analysis of photo-emission experiments assumes the final state energies on the nearly-free-electron-like model and hence it incorrectly ascribes the non-local self-energy correction to the final state energies to the occupied state energies, thus leading to a seeming narrowing in the bandwidth.

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