Selection rules for one- and two-photon absorption by excitons in carbon nanotubes

• Autor(a) principal: Barros, Eduardo Bedê
• Data de Publicação: 2006
• Outros Autores: 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.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional do INMETRO
• Texto Completo: http://hdl.handle.net/10926/1343

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.