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Kampfrath T, von Volkmann K, Aguirre CM, et al. Mechanism of the far-infrared absorption of carbon-nanotube films. Phys Rev Lett. 2008;101(26):267403doi: 10.1103/PhysRevLett.101.267403.
Kampfrath, T., von Volkmann, K., Aguirre, C. M., Desjardins, P., Martel, R., Krenz, M., Frischkorn, C., Wolf, M., & Perfetti, L. (2008). Mechanism of the far-infrared absorption of carbon-nanotube films. Physical review letters, 101(26), 267403. https://doi.org/10.1103/PhysRevLett.101.267403
Kampfrath, T, et al. "Mechanism of the far-infrared absorption of carbon-nanotube films." Physical review letters vol. 101,26 (2008): 267403. doi: https://doi.org/10.1103/PhysRevLett.101.267403
Kampfrath T, von Volkmann K, Aguirre CM, Desjardins P, Martel R, Krenz M, Frischkorn C, Wolf M, Perfetti L. Mechanism of the far-infrared absorption of carbon-nanotube films. Phys Rev Lett. 2008 Dec 31;101(26):267403. doi: 10.1103/PhysRevLett.101.267403. PMID: 19437671.
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Phys Rev Lett. 2008 Dec 31;101(26):267403. doi: 10.1103/PhysRevLett.101.267403.

Mechanism of the far-infrared absorption of carbon-nanotube films.

Physical review letters

T Kampfrath, K von Volkmann, C M Aguirre, P Desjardins, R Martel, M Krenz, C Frischkorn, M Wolf, L Perfetti

Affiliations

  1. Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany.

PMID: 19437671 DOI: 10.1103/PhysRevLett.101.267403

Abstract

The far-infrared conductivity of single-wall carbon-nanotube ensembles is dominated by a broad absorption peak around 4 THz whose origin is still debated. We observe an overall depletion of this peak when the nanotubes are excited by a short visible laser pulse. This finding excludes optical absorption due to a particle-plasmon resonance and instead shows that interband transitions in tubes with an energy gap of approximately 10 meV dominate the far-infrared conductivity. A simple model based on an ensemble of two-level systems naturally explains the weak temperature dependence of the far-infrared conductivity by the tube-to-tube variation of the chemical potential.

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