Anomalous quasiparticle lifetime and strong electron-phonon coupling in graphite

Katsuaki Sugawara, Takafumi Sato, Seigo Soma, Takashi Takahashi, H. Suematsu

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

We have performed ultrahigh-resolution angle-resolved photoemission spectroscopy on high-quality single crystals of graphite to elucidate the character of low-energy excitations. We found evidence for a well-defined quasiparticle (QP) peak in the close vicinity of the Fermi level comparable to the nodal QP in high-Tc cuprates, together with the mass renormalization of the band at an extremely narrow momentum region around the K(H) point. Analysis of the QP lifetime demonstrates the presence of strong electron-phonon coupling and linear energy dependence of the QP scattering rate indicative of a marked deviation from the conventional Fermi-liquid theory.

Original languageEnglish
Article number036801
JournalPhysical Review Letters
Volume98
Issue number3
DOIs
Publication statusPublished - 2007 Jan 26

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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