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We obtained the spectral function of very high quality natural graphitesingle crystals using angle resolved photoelectron spectroscopy (ARPES). Aclear separation of non-bonding and bonding bands and asymmetric lineshape areobserved. The asymmetric lineshapes are well accounted for by the finitephotoelectron escape depth and the band structure. The extracted width of thespectral function (inverse of the photohole life time) near the K point is,beyond the maximum phonon energy, approximately proportional to the energy asexpected from the linear density of states near the Fermi energy. The upperbound for the electron-phonon coupling constant is about 0.2, a much smallervalue than the previously reported one.

Effect of linear density of states on the quasi-particle dynamics and small electron-phonon coupling in graphite