Magnetotransport in C-doped AlGaAs heterostructures

摘要

High-quality C-doped p-type AlGaAs heterostructures with mobilities exceeding 150 000 cm(2)/V s 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. (C) 2004 American Institute of Physics.