Multi-particle Auger dissociation of excitons in shallow doped carbon   nanotubes
  Shallow hole-doping in small diameter single-wall carbon nanotubes by H$_2$O$_2$ is shown to result in delocalized excited state quenching with no effects on the ground state absorption spectrum. To account for this process, the dissociation of excitons by shallow level electronic impurities is predicted to occur by multi-particle Auger decay. This mechanism, which relies on the chirality of the electronic states, causes the exciton to decay into electron-hole pairs with very high efficiencies. 
Jay D. Sau, Jared J. Crochet, Miguel Dimas, Juan G. Duque, Marvin L.   Cohen, Stephen K. Doorn
cond-mat.mes-hall cond-mat.mtrl-sci