Band widening in graphite
نویسندگان
چکیده
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. @S0163-1829~99!11403-6#
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