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http://hdl.handle.net/1843/42288| Type: | Artigo de Periódico |
| Title: | Resonant anti-stokes Raman scattering in single-walled carbon nanotubes |
| Authors: | Georgy Gordeev Ado Jorio de Vasconcelos Patryk Kusch Bruno Gondim de Melo Vieira Benjamin Scott Flavel Ralph Krupke Eduardo Bedê Barros Stephanie Reich |
| Abstract: | The dependence of the anti-Stokes Raman intensity on the excitation laser energy in carbon nanotubes is studied by resonant Raman spectroscopy. The complete resonant anti-Stokes and Stokes Raman profiles of the high-energy longitudinal phonon (G +) are obtained for (8,3), (7,5), (6,4), and (6,5) single chirality enriched samples. A high asymmetry between the intensity of the incoming and outgoing resonance is observed in the resonant Raman profiles. In contrast to Stokes scattering, anti-Stokes scattering is more intense at the outgoing resonance then at the incoming resonance. The resonance profiles are explained by a Raman process that includes the phonon-mediated interactions with the dark excitonic state. The chirality dependence of the Raman profiles is due to the variation in the exciton-phonon matrix elements, in agreement with tight-binding calculations. Based on the asymmetric Raman profiles we present the resonance factors for the Stokes/anti-Stokes ratios in carbon nanotubes. |
| Subject: | Espalhamento Raman Nanotubos de carbono |
| language: | eng |
| metadata.dc.publisher.country: | Brasil |
| Publisher: | Universidade Federal de Minas Gerais |
| Publisher Initials: | UFMG |
| metadata.dc.publisher.department: | ICX - DEPARTAMENTO DE FÍSICA |
| Rights: | Acesso Restrito |
| metadata.dc.identifier.doi: | https://doi.org/10.1103/PhysRevB.96.245415 |
| URI: | http://hdl.handle.net/1843/42288 |
| Issue Date: | 18-Dec-2017 |
| metadata.dc.url.externa: | https://journals.aps.org/prb/abstract/10.1103/PhysRevB.96.245415 |
| metadata.dc.relation.ispartof: | Physical Review B |
| Appears in Collections: | Artigo de Periódico |
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