1. Excitons and High-Order Optical Transitions in Individual Carbon Nanotubes
- Author
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Berciaud, Stephane, Voisin, Christophe, Yan, Hugen, Chandra, Bhupesh, Caldwell, Robert, Shan, Yuyao, Brus, Louis E., Hone, James, Heinz, Tony F., Departments of Physics and Electrical Engineering, Columbia University [New York], Department of Chemistry, Laboratoire Pierre Aigrain (LPA), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Department of Mechanical Engineering, Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), and Roussignol, Philippe
- Subjects
Condensed Matter::Materials Science ,Condensed Matter - Mesoscale and Nanoscale Physics ,[PHYS.COND.CM-GEN] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other] ,Condensed Matter::Other ,[PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other] ,Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ,FOS: Physical sciences ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect - Abstract
Communication orale; We address the issue of the excitonic nature of high-lying optical transitions in single-walled carbon nanotubes (SWNTs) by means of Rayleigh scat- tering spectroscopy of freely suspended individual nanotubes. A careful analysis of the E33 and E44 transitions in semiconducting and the M22 transitions in metallic nanotubes reveals that in both cases the lineshape is consistent with an excitonic model, but not with one involving free carriers. For semiconducting species, sidebands are observed at »200 meV above the main electronic transitions. These features are ascribed to exciton-phonon bound states. Such sidebands are barely visible for metallic nanotubes, as expected from the reduced strength of excitonic interactions in these systems. These ¯ndings [1] shed light on the na- ture of high-order optical transitions in SWNTS [2] and the strength of exciton-phonon coupling in metallic SWNTs [3,4]. References: [1] S. Berciaud et al., submitted (2009) [2] P.T. Araujo et al., PRL 98, 067401 (2007) [3] H. Zeng et al., PRL 102, 136406 (2009) [4] S. Berciaud et al., Nano Lett. 7 1203 (2007)
- Published
- 2010