Physics – Condensed Matter – Materials Science
Scientific paper
2004-12-16
Japanese Journal of Applied Physics, Vol. 44, No. 7A, 2005, pp. 5068-5072
Physics
Condensed Matter
Materials Science
11 pages; 7 figures; accepted for publication in Japanese Journal of Applied Physics
Scientific paper
10.1143/JJAP.44.5068
Electronic states in nanographite ribbons with zigzag edges are studied using the extended Hubbard model with nearest neighbor Coulomb interactions. The nearest Coulomb interactions stabilize electronic states with the opposite electric charges separated and localized along both edges. Such states are analogous as nanocondensers. Therefore, electric capacitance, defined using a relation of polarizability, is calculated to examine nano functionalities. We find that the behavior of the capacitance is widely different depending on whether the system is in the magnetic or charge polarized phases. In the magnetic phase, the capacitance is dominated by the presence of the edge states while the ribbon width is small. As the ribbon becomes wider, the capacitance remains with large magnitudes as the system develops into metallic zigzag nanotubes. It is proportional to the inverse of the width, when the system corresponds to the semiconducting nanotubes and the system is in the charge polarized phase also. The latter behavior could be understood by the presence of an energy gap for charge excitations.
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