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…
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"Dark" vs "Bright" Excitons in Carbon Nanotubes: Applications to Quantum Optics
- Physics
- 2009
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…