Electric Capacitance as Nanocondensers in Zigzag Nanographite Ribbons and Zigzag Carbon Nanotubes
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概要
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Electronic states in nanographite ribbons with zigzag edges and zigzag carbon nanotubes are studied using the extended Hubbard model with nearest-neighbor Coulomb interactions. The nearest-neighbor Coulomb interactions stabilize electronic states with the opposite electric charges separated and localized along both edges. Such states are analogous to nanocondensers. Therefore, electric capacitance, defined using a relation of polarizability, is calculated to examine the nano-functionalities of the system. We find that the behavior of the capacitance varies widely depending on whether the system is in the magnetic phase or charge-polarized phase. In the magnetic phase, capacitance is dominated by the presence of the edge states when the ribbon width is small. Even when the ribbon becomes wider, capacitance remains having a large magnitude as the system develops into metallic zigzag nanotubes. It is proportional to the inverse of ribbon 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.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2005-07-15
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