INVESTIGATION OF HGSE HGSE-FE QUANTUM-WELLS AND SUPER LATTICES/

High-field magnetospectroscopy measurements on HgSe/HgSe:Fe quantum we lls and superlattices are reported. Fe2+ substitution of Hg2+ manifest s itself in a donor about 210 meV above the conduction band edge and t hus for sufficiently high carrier concentration as a Fermi level pinne d system in the mixed valence regime. The MBE-grown samples on ZnTe/Ga As substrates exhibit 2D effects for characteristic well or superlatti ce dimensions < 20 nm. Strong anisotropy effects due to strain are obs erved. By variation of the size quantization the predicted transition from a 2D to 3D QHE for Fermi level pinned systems is demonstrated.