標題: Elementary excitations in a carbon nanotube
作者: Lin, MF
Chuu, DS
電子物理學系
Department of Electrophysics
關鍵字: elementary excitations;pi plasmon;carbon nanotube
公開日期: 1-三月-1997
摘要: A carbon nanotube exhibits the decoupled pi plasmons of different angular momenta (L's). The magnetic Aux is expected to be useful in identifying them. All the L-decoupled plasmons have strong dispersion relations with momentum (q). The L not equal 0 plasmons belong to optical plasmons, while the L = 0 plasmon could not exist at q --> 0. The former, respectively, behave as the plasmons in three- and two-dimensional electron gases at small and large q's. The plasmon frequencies would be affected by radius, chiral angle, and intertube interaction. To obtain the actual plasmon frequencies of a multi-shell nanotube, the intertube interactions from the neighboring shells have to be taken into account. The calculated results are consistent with the experimental measurements. A detailed comparison between a carbon nanotube and a graphite layer is also made. These two related systems may exhibit similar pi plasmons, when L = 0 in a nanotube. Furthermore, the chirality effect of the former corresponds to the anisotropy effect of the latter. The predicted q-, L-, and geometry-dependence of the pi plasmons needs further experimental verifications.
URI: http://dx.doi.org/10.1143/JPSJ.66.757
http://hdl.handle.net/11536/149483
ISSN: 0031-9015
DOI: 10.1143/JPSJ.66.757
期刊: JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume: 66
起始頁: 757
結束頁: 764
顯示於類別:期刊論文