%0 Conference Paper
%F Oral 
%T Biexcitons in semiconducting carbon nanotubes
%+ Laboratoire Charles Coulomb (L2C)
%+ Laboratoire de Photonique Quantique et Moléculaire (LPQM)
%+ Laboratoire Pierre Aigrain (LPA)
%A Colombier, Léo
%A Selles, Julien
%A Rousseau, Emmanuel
%A Lauret, J.-S
%A Vialla, F.
%A Voisin, C.
%A Cassabois, Guillaume
%< avec comité de lecture
%Z L2C:13-280
%B WONTON'13
%C Santa Fe, United States
%8 2013-06-17
%D 2013
%Z Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other]Conference papers
%X 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.
%G English
%L hal-00924470
%U https://hal.science/hal-00924470
%~ UNIV-PARIS7
%~ ENS-PARIS
%~ UPMC
%~ LPA
%~ CNRS
%~ ENS-CACHAN
%~ LPA-OPT
%~ L2C
%~ LPQM
%~ PSL
%~ UPMC_POLE_2
%~ MIPS
%~ UNIV-MONTPELLIER
%~ SORBONNE-UNIVERSITE
%~ SU-SCIENCES
%~ UNIV-PARIS
%~ ENS-PSL
%~ ENS-PARIS-SACLAY
%~ ALLIANCE-SU
%~ UM-2015-2021