摘要
Magnetoelectronic and optical properties of carbon nanotubes are, respectively, studied within the sp3 tight-binding model and the gradient approximation. They strongly depend on the magnitude and the direction of the magnetic field, the nanotube geometry (radius and chiral angle), and the Zeeman splitting. The magnetic field would lead to the change of energy gap, the destruction of state degeneracy, and the coupling of different angular momenta. Hence there are magnetic-field-dependent absorption frequencies and more absorption peaks. The types of carbon nanotubes predominate in the band structure and thus the range of absorption frequencies and the number of absorption peaks. The Zeeman splitting makes the semiconductor-metal transition occur at lower magnetic flux. It metalizes armchair carbon nanotubes in the presence of the perpendicular magnetic field. However, it does not affect the optical excitations except for metallic carbon nanotubes.
原文 | English |
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文章編號 | 045405 |
頁(從 - 到) | 454051-454059 |
頁數 | 9 |
期刊 | Physical Review B - Condensed Matter and Materials Physics |
卷 | 67 |
發行號 | 4 |
出版狀態 | Published - 2003 1月 15 |
All Science Journal Classification (ASJC) codes
- 電子、光磁材料
- 凝聚態物理學