Intense terahertz pulse induced exciton generation in carbon nanotubes

Shinichi Watanabe, Nobutsugu Minami, Ryo Shimano

研究成果: Article

56 引用 (Scopus)

抄録

We have investigated the highly nonlinear terahertz (THz) light-matter interaction in single-walled carbon nanotubes (SWNTs). The high-peak THz electric-field (∼0.7 MV/cm) and the low effective mass of carriers result in their ponderomotive energy exceeding the bandgap energy of semiconducting SWNTs. Under such an intense THz pulse irradiation, the interband excitation that results in the generation of excitons occurs, although the THz photon energy (∼4 meV) is much smaller than the gap energy of SWNTs (∼1 eV). The ultrafast dynamics of this exciton generation process is investigated by THz pump and optical probe spectroscopy. The exciton generation mechanism is described by impact excitation process induced by the strong THz E-field. Such intense THz pulse excitation provides a powerful tool to study nonlinear terahertz optics in non-perturbative regime as well as nonlinear transport phenomena in solids with ultrafast temporal resolution.

元の言語English
ページ(範囲)1528-1538
ページ数11
ジャーナルOptics Express
19
発行部数2
出版物ステータスPublished - 2011 1 17
外部発表Yes

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carbon nanotubes
excitons
pulses
excitation
nonlinear optics
temporal resolution
energy
pumps
irradiation
electric fields
probes
photons
spectroscopy
interactions

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

これを引用

Intense terahertz pulse induced exciton generation in carbon nanotubes. / Watanabe, Shinichi; Minami, Nobutsugu; Shimano, Ryo.

:: Optics Express, 巻 19, 番号 2, 17.01.2011, p. 1528-1538.

研究成果: Article

Watanabe, S, Minami, N & Shimano, R 2011, 'Intense terahertz pulse induced exciton generation in carbon nanotubes', Optics Express, 巻. 19, 番号 2, pp. 1528-1538.
Watanabe, Shinichi ; Minami, Nobutsugu ; Shimano, Ryo. / Intense terahertz pulse induced exciton generation in carbon nanotubes. :: Optics Express. 2011 ; 巻 19, 番号 2. pp. 1528-1538.
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