Direct Experimental Evidence of Exciton-Phonon Bound States in Carbon Nanotubes

Abstract

We present direct experimental observation of exciton-phonon bound states in the photoluminescence excitation spectra of isolated single walled carbon nanotubes in aqueous suspension. The photoluminescence excitation spectra from several distinct single-walled carbon nanotubes show the presence of at least one sideband related to the tangential modes, lying {200 meV} above the main absorption/emission peak. Both the energy position and line shapes of the sidebands are in excellent agreement with recent calculations [PRL {\bf 94},027402 (2005)] that predict the existence of exciton-phonon bound states, a sizable spectral weight transfer to these exciton-phonon complexes and that the amount of this transfer depends on the specific nanotube structure and diameter. The observation of these novel exciton-phonon complexes is a strong indication that the optical properties of carbon nanotubes have an excitonic nature and also of the central role played by phonons in describing the excitation and recombination mechanisms in carbon nanotubes.

References in corpus (3)

• Excitonic Effects and Optical Spectra of Single-Walled Carbon Nanotubes
• Scaling of excitons in carbon nanotubes
• Exciton-phonon effects in carbon nanotube optical absorption

Cited by in corpus (20)

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• Absorption spectroscopy of individual single-walled carbon nanotubes
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• Dependence of exciton transition energy of single-walled carbon nanotubes on surrounding dielectric materials
• Identification of excitonic phonon sideband by photoluminescence spectroscopy of single-walled carbon-13 nanotubes
• Triplet absorption in carbon nanotubes: a TD-DFT study
• Luminescence Properties of Individual Empty and Water-filled Single-Walled Carbon Nanotubes
• Excitons and high-order optical transitions in individual carbon nanotubes
• Strong exciton-plasmon coupling in semiconducting carbon nanotubes
• Observation of drastic electronic structure change in one-dimensional moiré crystals
• Chirality Dependence of the $K$-Momentum Dark Excitons in Carbon Nanotubes
• Possibility for exciton Bose-Einstein condensation in carbon nanotubes
• Experimental determination of the local optical conductivity of a semiconducting carbon nanotube and its modification at individual defects
• Observation of Exciton-Phonon Sideband in Individual Metallic Single-Walled Carbon Nanotubes
• Exciton-Plasmon Coupling in Carbon Nanotubes
• Universal non-resonant absorption in carbon nanotubes
• Survey of Exciton-Phonon Sidebands by Magneto-optical Spectroscopy Using Highly Purified (6,5) Single-walled Carbon Nanotubes
• Exciton-phonon Bound Complex in Single-walled Carbon Nanotubes Revealed by High-field Magneto-optical Spectroscopy
• Intrinsic process for upconversion photoluminescence via $K$-momentum phonon coupling in carbon nanotubes
• Local Classical and Quantum Criticality due to Electron-Vibration Interaction