Intersubband plasmon excitations in doped carbon nanotubes

Daria Satco, Ahmad R.T. Nugraha, M. Shoufie Ukhtary, Daria Kopylova, Albert G. Nasibulin, Riichiro Saito

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

6 Sitaatiot (Scopus)
165 Lataukset (Pure)

Abstrakti

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<2nm exhibit a dependence on (1/dt)0.7 and the frequencies are further affected by Fermi energy as EF0.25. 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.

AlkuperäiskieliEnglanti
Artikkeli075403
Sivut1-13
JulkaisuPhysical Review B
Vuosikerta99
Numero7
DOI - pysyväislinkit
TilaJulkaistu - 4 helmikuuta 2019
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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  • Siteeraa tätä

    Satco, D., Nugraha, A. R. T., Ukhtary, M. S., Kopylova, D., Nasibulin, A. G., & Saito, R. (2019). Intersubband plasmon excitations in doped carbon nanotubes. Physical Review B, 99(7), 1-13. [075403]. https://doi.org/10.1103/PhysRevB.99.075403