Trigonal Anisotropy in Graphite and Carbon Nanotubes
| Autor: | Jie Jiang, Ge. G. Samsonidze, Kentaro Sato, Alexander Grüneis, Luiz Gustavo Cançado, Cristiano Fantini, Riichiro Saito, Marcos A. Pimenta, Shin Grace Chou, Ado Jorio, M. S. Dresselhaus, Yutaka Oyama, G. Dresselhaus |
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| Rok vydání: | 2006 |
| Předmět: |
Materials science
Condensed matter physics Resonance Raman spectroscopy Selective chemistry of single-walled nanotubes Mechanical properties of carbon nanotubes General Chemistry Carbon nanotube Condensed Matter Physics law.invention Optical properties of carbon nanotubes Condensed Matter::Materials Science symbols.namesake law symbols General Materials Science Graphite Atomic physics Anisotropy Raman spectroscopy |
| Zdroj: | Molecular Crystals and Liquid Crystals. 455:287-294 |
| ISSN: | 1563-5287 1542-1406 |
| DOI: | 10.1080/15421400600698758 |
| Popis: | We discuss here how the trigonal warping effect of the electronic structure is relevant to optical processes in graphite and carbon nanotubes. The electron-photon, electron-phonon, and elastic scattering matrix elements have a common factor of the coefficients of Bloch wave funtions of the A and B atoms in the graphite unit cell. Because of the three fold symmetry around the Fermi energy point (the K or K′ point), the matrix elements show a trigonal anisotropy which can be observed in both resonance Raman and photoluminescence spectroscopy. This anisotropy is essential for understanding the chirality dependence of the Raman intensity and the optical response of single wall carbon nanotubes. |
| Databáze: | OpenAIRE |
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