Unifying the low-temperature photoluminescence spectra of carbon nanotubes: the role of acoustic phonon confinement

Abstract

At low temperature the photoluminescence of single-wall carbon nanotubes show a large variety of spectral profiles ranging from ultra narrow lines in suspended nanotubes to broad and asymmetrical line-shapes that puzzle the current interpretation in terms of exciton-phonon coupling. Here, we present a complete set of photoluminescence profiles in matrix embedded nanotubes including unprecedented narrow emission lines. We demonstrate that the diversity of the low-temperature luminescence profiles in nanotubes originates in tiny modifications of their low-energy acoustic phonon modes. When low energy modes are locally suppressed, a sharp photoluminescence line as narrow as 0.7 meV is restored. Furthermore, multi-peak luminescence profiles with specific temperature dependence show the presence of confined phonon modes.

References in corpus (5)

• Photon Antibunching in the Photoluminescence Spectra of a Single Carbon Nanotube
• Observation of charged excitons in hole-doped carbon nanotubes using photoluminescence and absorption spectroscopy
• Optical signatures of quantum dot excitons in carbon nanotubes
• Non-Markovian decoherence of localized nanotube excitons by acoustic phonons
• Prolonged spontaneous emission and dephasing of localized excitons in air-bridged carbon nanotubes

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• Dipolar and charged localized excitons in carbon nanotubes
• Quantum emission assisted by energy landscape modification in pentacene-decorated carbon nanotubes
• Effect of phonon bath dimensionality on the spectral efficiency of single-photon emitters in the Purcell regime
• Reconciling nonlinear dissipation with the bilinear model of two Brownian particles