Direct experimental evidence of exciton-phonon bound states in carbon nanotubes.

Exciton transition energy in photoluminescence of single-walled carbon nanotubes

Photoluminescence excitation (PLE) spectroscopy of single-walled carbon nanotubes (SWNTs) has been extensively studied for characterization of their unique electronic properties due to the one-dimensionality. The precise evaluation of exciton transition energy is essential for experimental assignments of optical absorption, photoluminescence, and resonant Raman scatterings. Here, several experi...

Title Observation of exciton-phonon sideband in individual metallic single-walled carbon nanotubes

Micro-Photoluminescence Spectroscopy of Excitons in Individual Single-Walled Carbon Nanotubes

Single-walled carbon nanotubes (SWNTs) are fascinating materials to study onedimensional photophysics. Their optical properties are strongly affected by strong Coulomb interactions and are determined by ”excitons” which represent the quantum of polarization in non-metallic solids. In this thesis dissertation we have experimentally investigated both the structure and the dynamics of excitons in ...

Energy of K-momentum dark excitons in carbon nanotubes by optical spectroscopy.

Phonon sideband optical spectroscopy determines the energy of the dark K-momentum exciton for (6,5) carbon nanotubes. One-phonon sidebands appear in absorption and emission, split by two zone-boundary (K-point) phonons. Their average energy locates the E11 K-momentum exciton 36 meV above the E11 bright level, higher than available theoretical estimates. A model for exciton-phonon coupling shows...

Spectral features due to dark exciton in photoluminescence map of single-walled carbon nanotubes

Features in Photoluminescence Map of SWNTs Over the past seven years photoluminescence (PL) spectroscopy has emerged as an important characterization tool for determining the (n, m) chirality and population of semiconducting SWNTs. This technique is essential for the chirality selective growth and/or the separation depending on chirality. Under excitation with the appropriate wavelength of ligh...