Low-Frequency π-Electronic Excitations of Simple Hexagonal Graphite

F. L. Shyu, Min-Fa Lin

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


The simple hexagonal graphite exhibits novel excitation properties. The low-frequency π-electronic excitations principally reflect the π-band characteristics, the strong wave-vector-dependence, the highly anisotropic behavior, and the special symmetry. The plasmon frequency increases with momentum, while the opposite is true for the intensity of plasmon peak. The low-frequency plasmon behaves as the optical plasmon in a 3D electron gas. The main differences between plasrnons parallel and perpendicular to the graphite planes are very special. The former have higher plasmon frequencies. However, their plasmon peaks and critical momenta are much lower than those of the latter. Doping leads to significant changes in the π-electronic excitations, such as the great enhancement of plasmon frequency and plasmon peak. The electronic excitations of the simple hexagonal graphite quite differ from those in the Bernal graphite or the 2D graphite sheet.

Original languageEnglish
Pages (from-to)897-901
Number of pages5
JournalJournal of the Physical Society of Japan
Issue number3
Publication statusPublished - 2001 Mar 1

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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