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We have performed high-resolution ARPES on high-quality single crystals of graphite (kish graphite) to elucidate detailed electronic structure related to the anomalous phenomena found in graphite and carbon-based materials. We found evidence for a well-defined quasiparticle (QP) peak in the close vicinity of the Fermi level comparable to high-Tc cuprates, together with the mass renormalization of the band at an extremely narrow momentum region around the K(H) point[1]. By self-energy analysis of the observed QP, we conclude that the band renormalization is caused by the strong electron-phonon coupling. We also revealed a weakly dispersive band near the top of hole pocket around the K(H) point which is ascribable to the theoretically predicted "edge-localized state" at the stepped surface [2].
[1] K. Sugawara et al., Phys. Rev. Lett., 98 (2007) 036801. [2] K. Sugawara et al., Phys. Rev. B., 73 (2006) 045124. |
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