Intense terahertz pulse induced exciton generation in carbon nanotubes

Shinichi Watanabe, Nobutsugu Minami, Ryo Shimano

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1528-1538
Number of pages11
JournalOptics Express
Volume19
Issue number2
Publication statusPublished - 2011 Jan 17
Externally publishedYes

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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

Cite this

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

In: Optics Express, Vol. 19, No. 2, 17.01.2011, p. 1528-1538.

Research output: Contribution to journalArticle

Watanabe, S, Minami, N & Shimano, R 2011, 'Intense terahertz pulse induced exciton generation in carbon nanotubes', Optics Express, vol. 19, no. 2, pp. 1528-1538.
Watanabe, Shinichi ; Minami, Nobutsugu ; Shimano, Ryo. / Intense terahertz pulse induced exciton generation in carbon nanotubes. In: Optics Express. 2011 ; Vol. 19, No. 2. pp. 1528-1538.
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