Comment on ``Energy Dependence of Electron Lifetime in Graphite Observed with Femtosecond Photoemission Spectroscopy'' (PRL 76, 483(1996).)
arXiv:cond-mat/9606048 · doi:10.1103/PhysRevLett.77.1410
Abstract
We comment on the theoretical interpretations applied to a recent experiment on electron lifetime in graphite. We point out that the acoustic-plasmon excitations in a layered two-dimensional electron system do not produce a linear energy dependence for the Coulomb scattering rate.
4 pages, RevTex, no figures. Also available at http://www-cmg.physics.umd.edu/~lzheng/ . Phys. Rev. Lett. (to appear)