Aharonov-Bohm Exciton Absorption Splitting in Chiral Specific   Single-Walled Carbon Nanotubes in Magnetic Fields of up to 78 T
  The Ajiki-Ando (A-A) splitting of single-walled carbon nanotubes(SWNT) originating from the Aharanov-Bohm effect was observed in chiral specific SWNTs by the magneto-absorption measurements conducted at magnetic fields of up to 78 T. The absorption spectra from each chirality showed clear A-A splitting of the $E_{11}$ optical excitonic transitions. The parameters of both the dark-bright exciton energy splitting and the rate of A-A splitting in a magnetic field were determined for the first time from the well-resolved absorption spectra. 
Shojiro Takeyama, Hirofumi Suzuki, Hiroyuki Yokoi, Yoichi Murakami,   and Shigeo Maruyama
cond-mat.mes-hall cond-mat.mtrl-sci