Author(s): Barros, Eduardo Bedê ; Capaz, Rodrigo Barbosa ; Vasconcelos, Ado Jorio de ; Samsonidze, Georgii G. ; Souza Filho, Antonio Gomes de ; Ismail-Beigi, Sohrab ; Spataru, Catalin D. ; Louie, Steven G. ; Dresselhaus, Gene ; Dresselhaus, Mildred S.
Date: 2006
Persistent ID: http://hdl.handle.net/10926/1343
Origin: Oasisbr
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Recent optical absorption and emission experiments showed that the lower energy optical transitions in carbon nanotubes are excitonic in nature, as predicted by theory. These experiments were based on the symmetry aspects of free electron-hole states and bound excitonic states. The present work shows, however, that group theory does not predict the selection rules needed to explain the two photon experiments. We obtain the symmetries and selection rules for the optical transitions of excitons in single-wall carbon nanotubes within the approach of the group of the wave vector, thus providing important information for the interpretation of theoretical and experimental optical spectra of these materials.
4 p. : il.
