Magnetotransport in wide parabolic PbTe quantum wells

The 3D and 2D behaviour of wide parabolic PbTe single quantum wells, which consist of PbTe p-n-p structures, are studied theoretically and experimentally. A simple model combines the 2D sub-band levels and the 3D Landau levels in order to calculate the density of states in a magnetic field perpendicular to the 2D plane. It is shown that at a channel width of about 300 nm, one can expect to observe 3D and 2D behaviour at the same time. Magnetotransport experiments in selectively contacted Hall bar samples are performed at temperatures down to T=50 mK, and at magnetic fields up to B = 17 T.