Anomalous Quasiparticle Lifetime in Graphite: Band Structure Effects

Details Anomalous Quasiparticle Lifetime in Graphite: Band Structure Effects Anomalous Quasiparticle Lifetime in Graphite: Band Structure Effects

2001-07-02

arxiv.org/abs/cond-mat/0107043v1

Phys. Rev. Lett. 87, 246405 (2001)

Physics

Condensed Matter

4 pages, 4 figures, submitted PRL

Scientific paper

10.1103/PhysRevLett.87.246405

We report ab initio calculation of quasiparticle lifetimes in graphite, as determined from the imaginary part of the self-energy operator within the GW aproximation. The inverse lifetime in the energy range from 0.5 to 3.5 eV above the Fermi level presents significant deviations from the quadratic behavior naively expected from Fermi liquid theory. The deviations are explained in terms of the unique features of the band structure of this material. We also discuss the experimental results from different groups and make some predictions for future experiments.

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