Sharp contrasts in low-energy quasiparticle dynamics of graphite between Brillouin zone K and H points |
| |
Authors: | Lee J D Han S W Inoue J |
| |
Institution: | School of Materials Science, Japan Advanced Institute of Science and Technology, Ishikawa 923-1292, Japan. |
| |
Abstract: | The low-energy quasiparticle (QP) dynamics of graphite are governed by a coupling with the E(2g) longitudinal optical phonon of omega(LO) approximately 200 meV, which is found to dramatically depend on the electronic band dispersion epsilon(k). A discontinuity of the QP linewidth develops near omega(LO) for a linear band with a quadratic band top near the Brillouin zone (BZ) K point], while it disappears for a pure linear band (near the BZ H point). It is also found that the effective electron-phonon coupling near the K point is stronger than near the H point by more than 50%. This finding makes possible a consistent understanding of recent angle-resolved photoemission observations near the K point. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|