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Comment on ``Energy Dependence of Electron Lifetime in Graphite Observed with Femtosecond Photoemission Spectroscopy'' (PRL 76, 483(1996).)

Lian Zheng, S. Das Sarma

cond-matarXiv:cond-mat/9606048

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.

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