Excitons and high-order transitions in individual carbon nanotubes
| Autor: | Berciaud, Stéphane, Voisin, Christophe, Yan, Hugen, Chandra, Bhupesh, Caldwell, Robert, Shan, Yuyao, Brus, Louis, Hones, James, Heinz, Tony |
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| Přispěvatelé: | Roussignol, Philippe, Departments of Physics and Electrical Engineering, Columbia University [New York], Laboratoire Pierre Aigrain (LPA), 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), Department of Mechanical Engineering, Department of Chemistry, 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) |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | GDRI GNT Meeting 2011 GDRI GNT Meeting 2011, Feb 2011, Dourdan, France |
| Popis: | Poster; We examine the excitonic nature of high-lying optical transitions in single-walled carbon nanotubes by means of Rayleigh scattering spectroscopy. A careful analysis of the principal transitions of individual semiconducting and metallic nanotubes reveals that in both cases the lineshape is consistent with an excitonic model, but not one of free-carriers. For semiconducting species, side-bands are observed at 200 meV above the third and fourth optical transitions. These features are ascribed to exciton-phonon bound states. Such side-bands are not apparent for the second order transition in metallic nanotubes, as expected from the reduced strength of excitonic interactions in these one-dimensional metals. Our findings [1] represent a step towards resolving an ongoing controversy over the nature of high-order optical transitions in carbon nanotubes [2] and quantifying the strength of exciton-phonon coupling in metallic nanotubes. References [1] S. Berciaud, C. Voisin et al., Phys. Rev. B. 81, 041414(R) (2010). [2] P.T. Araujo et al., Phys. Rev. Lett. 98, 067401 (2007). P.T. Araujo et al., Phys. Rev. Lett. 103, 146802 (2009). [3] M. Y. Sfeir et al., Science, 306, 1540 (2004). |
| Databáze: | OpenAIRE |
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