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.

7 pages, 5 figures, submitted to Phys. Rev. B

References in corpus (2)

• Exciton binding energies in carbon nanotubes from two-photon photoluminescence
• Electron-electron interaction effects on optical excitations in semiconducting single-walled carbon nanotubes

Cited by in corpus (5)

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• pi-Electron theory of transverse optical excitons in semiconducting single-walled carbon nanotubes
• Electron-electron interaction effects on the photophysics of metallic single-walled carbon nanotubes
• 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