dorsal/arxiv
View SchemaCalculations of Electric Capacitance in Carbon and BN Nanotubes, and Zigzag Nanographite (BN, BCN) Ribbons
| Authors | Kikuo Harigaya |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0501095 |
| URL | https://arxiv.org/abs/quant-ph/0501095 |
| DOI | 10.1016/j.physe.2005.06.042 |
| Journal | Physica E 29 (2005) 628-632 |
Abstract
Electronic states in nanographite ribbons with zigzag edges are studied using the extended Hubbard model with nearest neighbor Coulomb interactions. The electronic states with the opposite electric charges separated along both edges 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. In the BN (BCN) nanotubes and ribbons, the electronic structure is always like of semiconductors. The calculated capacitance is inversely proportional to the distance between the positive and negative electrodes.
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"abstract": "Electronic states in nanographite ribbons with zigzag edges are studied using\nthe extended Hubbard model with nearest neighbor Coulomb interactions. The\nelectronic states with the opposite electric charges separated along both edges\nare analogous as nanocondensers. Therefore, electric capacitance, defined using\na relation of polarizability, is calculated to examine nano-functionalities. We\nfind that the behavior of the capacitance is widely different depending on\nwhether the system is in the magnetic or charge polarized phases. In the\nmagnetic phase, the capacitance is dominated by the presence of the edge states\nwhile the ribbon width is small. As the ribbon becomes wider, the capacitance\nremains with large magnitudes as the system develops into metallic zigzag\nnanotubes. It is proportional to the inverse of the width, when the system\ncorresponds to the semiconducting nanotubes and the system is in the charge\npolarized phase also. The latter behavior could be understood by the presence\nof an energy gap for charge excitations. In the BN (BCN) nanotubes and ribbons,\nthe electronic structure is always like of semiconductors. The calculated\ncapacitance is inversely proportional to the distance between the positive and\nnegative electrodes.",
"arxiv_id": "quant-ph/0501095",
"authors": [
"Kikuo Harigaya"
],
"categories": [
"quant-ph",
"cond-mat.mtrl-sci",
"cond-mat.str-el",
"physics.chem-ph"
],
"doi": "10.1016/j.physe.2005.06.042",
"journal_ref": "Physica E 29 (2005) 628-632",
"title": "Calculations of Electric Capacitance in Carbon and BN Nanotubes, and Zigzag Nanographite (BN, BCN) Ribbons",
"url": "https://arxiv.org/abs/quant-ph/0501095"
},
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