Abstract
We report a high-field magneto-optical study on first and second subband transitions of single-chirality single-walled carbon nanotubes. The ordering and relative energy splitting between bright and dark excitonic states were found to be inverse between the first and second subbands. We verified that the zero-momentum dark singlet exciton lies below the bright exciton for the first subband transitions, while for the second subband transitions, it was found to have higher energy than the bright excitonic state. The effect of this peculiar excitonic structure was found to manifest itself in distinctive Aharonov-Bohm splitting in ultrahigh magnetic fields up to 190 T.
- Received 3 April 2013
DOI:https://doi.org/10.1103/PhysRevB.87.241406
©2013 American Physical Society