Intersubband plasmon excitations in doped carbon nanotubes

We theoretically investigate intersubband plasmon excitations in doped single-wall carbon nanotubes (SWNTs) by examining the dependence of plasmon frequency on the nanotube diameter, chirality, and Fermi energy. The intersubband plasmons can be excited by light with polarization perpendicular to the...

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Bibliographic Details
Published in:Physical review. B 2019-02, Vol.99 (7), p.075403, Article 075403
Main Authors: Satco, Daria, Nugraha, Ahmad R. T., Ukhtary, M. Shoufie, Kopylova, Daria, Nasibulin, Albert G., Saito, Riichiro
Format: Article
Language:English
Subjects:
Chirality
Dependence
Excitation
Plasmons
Single wall carbon nanotubes
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Summary:We theoretically investigate intersubband plasmon excitations in doped single-wall carbon nanotubes (SWNTs) by examining the dependence of plasmon frequency on the nanotube diameter, chirality, and Fermi energy. The intersubband plasmons can be excited by light with polarization perpendicular to the nanotube axis and thus the plasmon excitations correspond to optical transitions between the two different subbands, which are sensitive to the Fermi energy. In every SWNT, this mechanism leads to the emergence of the optical absorption peak at the plasmon frequency for a given Fermi energy, EF. The plasmon frequencies calculated for many SWNTs with diameter dt< 2 nm exhibit a dependence on (1/dt)0.7 and the frequencies are further affected by Fermi energy as E0.25F. With this knowledge, it is possible to develop a map of intersubband plasmon excitations in doped SWNTs that could be useful to quickly estimate the doping level and also be an alternative way to characterize nanotube chirality.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.99.075403