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Phys. Rev. B 59, 4680–4684 (1999)

Band widening in graphite

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C. Heske*
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720

R. Treusch† and F. J. Himpsel
Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706

S. Kakar
Department of Applied Science, University of California at Davis/Livermore, Livermore, California 94550

L. J. Terminello
Lawrence Livermore National Laboratory, Livermore, California 94550

H. J. Weyer
Swiss Light Source, Paul-Scherrer Institute, Villigen PSI, Switzerland

E. L. Shirley
National Institute of Standards and Technology, Optical Technology Division, Gaithersburg, Maryland 20899

Received 15 May 1998; published in the issue dated 15 February 1999

The valence band width of graphite is determined with high accuracy by imaging the momentum distribution of photoelectrons for various binding energies. Compared to local-density-functional theory, the experimental band width (22.0 eV) is stretched by about 11%. Quasiparticle calculations, which properly describe electron interaction effects on the excited states of a solid, give a width of 21.8 eV, in agreement with the experiment within the experimental and theoretical relative uncertainty of about 1%. The results demonstrate the importance of including final-state and associated many-body effects into the theoretical description of the electronic structure of solids.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.59.4680
DOI:
10.1103/PhysRevB.59.4680
PACS:
71.15.-m, 71.20.-b, 73.20.At, 79.60.Bm

*Present address: Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany. Electronic address: heske@physik.uni-wuerzburg.de

†Present address: HASYLAB/DESY, Notkestr. 85, D-22603 Hamburg, Germany.

 
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