Cross-polarized optical absorption of single-walled nanotubes probed by polarized photoluminescence excitation spectroscopy

Abstract

Cross-polarized absorption peaks of isolated single-walled carbon nanotubes were observed by a polarized photoluminescence excitation (PLE) spectroscopy. Using a simple theory for PL anisotropy, the observed PLE spectra are decomposed into 'pure' components of the photoexcitation for incident light polarized parallel and perpendicular to the SWNT axis. For several (n, m) SWNTs, distinct peaks corresponding to perpendicular excitation were observed. The measured transition energies for perpendicular excitations were blue-shifted compared to the qualitative values predicted within a single-particle theory. The results indicate a smaller exciton binding energy for perpendicular excitations than for parallel excitations.

arXiv comment7 pages, 5 figures, submitted to Phys. Rev. B

References in corpus (8)

• Excitonic Effects and Optical Spectra of Single-Walled Carbon Nanotubes
• Scaling of excitons in carbon nanotubes
• Exciton binding energies in carbon nanotubes from two-photon photoluminescence
• Electron-electron interaction effects on optical excitations in semiconducting single-walled carbon nanotubes
• Exciton-phonon effects in carbon nanotube optical absorption
• Direct Experimental Evidence of Exciton-Phonon Bound States in Carbon Nanotubes
• Identification of excitonic phonon sideband by photoluminescence spectroscopy of single-walled carbon-13 nanotubes
• Optical dichroism in nanotubes

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• Direct Observation of Cross-Polarized Excitons in Aligned Single-Chirality Single-Wall Carbon Nanotubes
• Electron-electron interaction effects on the photophysics of metallic single-walled carbon nanotubes
• Electron-Hole Asymmetry in Single-Walled Carbon Nanotubes Probed by Direct Observation of Transverse Quasi-Dark Excitons
• Optical Identification of a DNA-Wrapped Carbon Nanotube: Signs of Helically Broken Symmetry
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• Macroscopically Self-Aligned and Chiralized Carbon Nanotubes: From Filtration to Innovation
• One-electron states and interband optical absorption in single-wall carbon nanotubes
• Universality in the Photophysics of pi-Conjugated Polymers and Single-Walled Carbon Nanotubes
• Origin of the Background Absorption in Carbon Nanotubes: Phonon-Assisted Excitonic Continuum