Intrinsic accuracy in 3-dimensional photoemission band mapping

Details Intrinsic accuracy in 3-dimensional photoemission band mapping Intrinsic accuracy in 3-dimensional photoemission band mapping

2002-10-18

arxiv.org/abs/cond-mat/0210404v2

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 6 Postscript figures, minor revisions, J. Electr. Spectr. Relat. Phenom. (in press)

Scientific paper

Fundamental principles of mapping 3-dimensional quasiparticle dispersions in the valence band using angle-resolved photoemission spectroscopy are discussed. Such mapping is intrinsically limited in accuracy owing to damping of the final states, resulting in equivalent broadening in the surface-perpendicular wavevector. Mechanisms of the intrinsic accuracy are discussed in depth based on a physically transparent picture involving interplay of the final- and initial-state spectral functions, and illustrated by photoemission simulations and experimental examples. Other interesting effects of 3-dimensional dispersions include 'ghost' peaks in the unoccupied valence band region and finite peak width at the Fermi level. Finally, optimization of the experiment on the intrinsic accuracy is discussed.

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