Theoretical investigation on electronic properties of topological materials: Möbius nanographite and conjugated polymers
| Autor: | Atsushi Yamashiro, Kikuo Harigaya, Yukihiro Shimoi, Katsunori Wakabayashi |
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| Rok vydání: | 2005 |
| Předmět: |
Quantitative Biology::Biomolecules
Electron density Magnetic domain Condensed matter physics Chemistry Mechanical Engineering Metals and Alloys Electronic structure Condensed Matter Physics Topology Polarization (waves) Electronic Optical and Magnetic Materials Condensed Matter::Soft Condensed Matter Domain wall (magnetism) Mechanics of Materials Electric field Materials Chemistry Boundary value problem Charge density wave |
| Zdroj: | Synthetic Metals. 152:261-264 |
| ISSN: | 0379-6779 |
| DOI: | 10.1016/j.synthmet.2005.07.093 |
| Popis: | Recent theoretical developments on topological materials, Mobius nanographite and Mobius conjugated polymers, are reported. (I) In nanographite systems with the Mobius boundary condition, there appears a novel magnetic domain. However, this domain state competes against the helical magnetic states. Total energies of the latter states are always lower than that of the former state. Additionally, the domain wall appears in the charge density wave states. (II) Optical properties of Mobius conjugated polymers are studied. We discuss that oligomers with a few structural units are more effective than polymers, in order to measure effects of discrete wave numbers which are shift by the Mobius boundary from those of the periodic boundary. Certain components of the optical absorption for the electric field perpendicular to the polymer axis mix with the absorption spectra for the electric filed parallel with the polymer axis. The polarization dependences of electric field of light can detect whether conjugated polymers have the Mobius boundary or not. |
| Databáze: | OpenAIRE |
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