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

Abstract

We obtained the spectral function of very high quality natural graphite single crystals using angle resolved photoelectron spectroscopy (ARPES). A clear separation of non-bonding and bonding bands and asymmetric lineshape are observed. The asymmetric lineshapes are well accounted for by the finite photoelectron escape depth and the band structure. The extracted width of the spectral function (inverse of the photohole life time) near the K point is, beyond the maximum phonon energy, approximately proportional to the energy as expected from the linear density of states near the Fermi energy. The upper bound for the electron-phonon coupling constant is about 0.2, a much smaller value than the previously reported one.

7 pages, 7 figures

References in corpus (4)

• Two Dimensional Atomic Crystals
• First direct observation of Dirac fermions in graphite
• Velocity Renormalization and Carrier Lifetime in Graphene from Electron-Phonon Interaction
• Low energy excitations in graphite: The role of dimensionality and lattice defects

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• Colloquium: Graphene spectroscopy
• Electron-Phonon Interactions in Graphene, Bilayer Graphene, and Graphite
• Coherent and incoherent electron-phonon coupling in graphite observed with radio-frequency compressed ultrafast electron diffraction
• Anisotropic Electron-Phonon Coupling and Dynamical Nesting on the Graphene Sheets in CaC6
• Electronic structure of superconducting KC${}_8$ and non-superconducting LiC${}_6$ graphite intercalation compounds: Evidence for a graphene-sheet-driven superconducting state
• Observation of inhibited electron-ion coupling in strongly heated graphite
• Kohn anomaly and interplay of electron-electron and electron-phonon interactions in epitaxial graphene
• Departure from the conical dispersion in epitaxial graphene
• High resolution angle resolved photoemission studies on quasi-particle dynamics in graphite