Magnetotransport in C-doped AlGaAs heterostructures
  High-quality C-doped p-type AlGaAs heterostructures with mobilities exceeding 150 000 cm$^2$/Vs are investigated by low-temperature magnetotransport experiments. We find features of the fractional quantum Hall effect as well as a highly resolved Shubnikov-de Haas oscillations at low magnetic fields. This allows us to determine the densities, effective masses and mobilities of the holes populating the spin-split subbands arising from the lack of inversion symmetry in these structures. 
B. Grbic, C. Ellenberger, T. Ihn, K.Ensslin, D. Reuter, and A. D.   Wieck