Résumé:

Single-walled carbon nanotubes 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 SWNTs optical properties. I will review the importance of the exciton-exciton interactions in SWNTs in the light of the exciton recombination dynamics, the excitonic collision broadening, and the biexciton.