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Communication Dans Un Congrès Année : 2013

Biexcitons in semiconducting carbon nanotubes

Julien Selles
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  • PersonId : 932583
Emmanuel Rousseau
J.-S Lauret
F. Vialla
Guillaume Cassabois
  • Fonction : Auteur
  • PersonId : 884878

Résumé

Single-walled carbon nanotubes (SWNT) are one-dimensional nanostructures where the Coulomb interactions between charge carriers are strongly enhanced compared to systems of higher dimensionality. This results in an electron-hole bound state -the so-called exciton- with a binding energy of the order of one third of the bandgap, which controls the SWNT's optical properties. As a matter of fact, the exciton-exciton interactions are particularly efficient and drive the exciton recombination and dephasing dynamics. The investigation of excitonic complexes in semiconducting SWNTs is currently a topic of intense debate. The biexciton and the trion are expected to have a binding energy of about a hundred meVs. Whereas the trion has been recently observed, first in doped nanotubes and then by means of all-optical generation, there is no experimental evidence for the biexciton. Here we present the first observation of the biexciton in semiconducting single-wall carbon nanotubes using nonlinear optical spectroscopy. Our experiments consist in a spectrally resolved pump-probe technique in SWNTs embedded in a gelatine at cryogenic temperature. Our measurements of the differential transmission spectrum reveal the universal asymmetric line shape of the Fano resonance intrinsic to the biexciton transition.
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Dates et versions

hal-00924470 , version 1 (06-01-2014)

Identifiants

  • HAL Id : hal-00924470 , version 1

Citer

Léo Colombier, Julien Selles, Emmanuel Rousseau, J.-S Lauret, F. Vialla, et al.. Biexcitons in semiconducting carbon nanotubes. WONTON'13, Jun 2013, Santa Fe, United States. ⟨hal-00924470⟩
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