Mand-Body Effects in Graphite Intercalation Compounds and Graphene Tubules

• Main Authors: Ming-Fa Lin, 林明發
• Other Authors: Kenneth Wen-Kai Shung
• Format: Others
• Language: en_US
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/04782904987166269994

博士 === 國立清華大學 === 物理研究所 === 81 === In this thesis, we studied many-body effects in two graphite- related systems: graphite intercalation compounds (GIC''s) and graphene tubules. Both of the systems are made of graphite sheets, and atoms or moleculars could be intercalated into them to enhance the carrier density but without modifying the honey comb structure of the graphite layers. Owing to these similarities, we could build up our theory for the systems by employing the unique band structure of a single graphite sheet. Very different symmetries of the two structures, however, make them behave differently. GIC''s are made of periodically staked graphite layers; as a result, the system could exhibit rich one-, two-, and three-dimensional properties. For GIC''s, we have studied their screening behaviors, transport properties, self-energy correction, and excitonic effects. A graphene tubule is a rolled-up graphite sheet in a cylindrical form with a diameter in the nanometers. Due to the microscopic structure, graphene tubules have novel one- and two-dimensional physical properties. In this work, we studied elementary excitations, magnetoplasmons and persistent currents, and self-energy correction of the graphene tubules. During the studies, we have paid special attention to compare the many-body theory with the experiments, and have predicted some novel features which have yet to be verified experimentally. The results of this research clearly illustrate that the many-body effects are fundamental to the understanding of the important physical properties of these two systems.