• Corpus ID: 117910747

Direct Observation of Dark Excitons in Individual Carbon Nanotubes: Role of Local Environments

@article{Srivastava2008DirectOO,
  title={Direct Observation of Dark Excitons in Individual Carbon Nanotubes: Role of Local Environments},
  author={A. Srivastava and Han Htoon and Victor I. Klimov and Junichiro Kono},
  journal={arXiv: Mesoscale and Nanoscale Physics},
  year={2008}
}
We report the direct observation of the spin-singlet dark excitonic state in individual single-walled carbon nanotubes through low-temperature micro-photoluminescence spectroscopy in magnetic fields. A magnetic field up to 5 T, applied along the nanotube axis, brightened the dark state, leading to the emergence of a new emission peak. The peak rapidly grew in intensity with increasing field at the expense of the originally-dominant bright exciton peak and finally became dominant at fields $>$3… 
"Dark" vs "Bright" Excitons in Carbon Nanotubes: Applications to Quantum Optics
It is strong Coulomb effects in carbon nanotubes that lead to formation of the so-called "bright" and "dark" (forbidden one-photon optical transition) exciton states, and dramatically decrease the