Excitonic optical transitions characterized by Raman excitation profiles in single-walled carbon nanotubes
| Autor: | Valentin N. Popov, Jean-Christophe Blancon, Raul Arenal, Fabrice Vallée, Ahmed Zahab, Anthony Ayari, Matthieu Paillet, Huy-Nam Tran, N. Del Fatti, Alfonso San-Miguel, J.L. Sauvajol, Jean-Roch Huntzinger |
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| Přispěvatelé: | Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), University of Zaragoza - Universidad de Zaragoza [Zaragoza], University of Sofia |
| Rok vydání: | 2016 |
| Předmět: |
Physics
02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Spectral line Optical properties of carbon nanotubes symbols.namesake 0103 physical sciences [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] symbols Absorption (logic) Atomic physics Rayleigh scattering 010306 general physics 0210 nano-technology Raman spectroscopy Raman scattering Energy (signal processing) Excitation |
| Zdroj: | Physical Review B: Condensed Matter and Materials Physics (1998-2015) Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2016, 94, pp.075430. ⟨10.1103/PhysRevB.94.075430⟩ |
| ISSN: | 2469-9969 2469-9950 1098-0121 1550-235X |
| DOI: | 10.1103/physrevb.94.075430 |
| Popis: | We examine the excitonic nature of the ${E}_{33}$ optical transition of the individual free-standing index-identified $(23,7)$ single-walled carbon nanotube by means of the measurements of its radial-breathing-mode and $G$-mode Raman excitation profiles. We confirm that it is impossible to determine unambiguously the nature of its ${E}_{33}$ optical transition (excitonic vs band to band) based only on the excitation profiles. Nevertheless, by combining Raman scattering, Rayleigh scattering, and optical absorption measurements on strictly the same individual $(23,7)$ single-walled carbon nanotube, we show that the absorption, Rayleigh spectra, and Raman excitation profiles of the longitudinal and transverse $G$ modes are best fitted by considering the nature of the ${E}_{33}$ transition as excitonic. The fit of the three sets of data gives close values of the transition energy ${E}_{33}$ and damping parameter ${\mathrm{\ensuremath{\Gamma}}}_{33}$. This comparison shows that the fit of the Raman excitation profiles provides with good accuracy the energy and damping parameter of the excitonic optical transitions in single-walled carbon nanotubes. |
| Databáze: | OpenAIRE |
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