QUANTUM TRANSPORT AND MAGNETOOPTICS IN A MAGNETIC 2-DIMENSIONAL ELECTRON-GAS

A new class of magnetic heterostructures is studied wherein a two-dime nsional electron gas (2DEG) is strongly exchange coupled to a systemat ic distribution of local moments. From the longitudinal magnetoresista nce we extract the sheet concentration, single particle scattering tim e, and carrier effective mass. Magnetophotoluminescence measurements y ield an estimate of the spin splitting of the 2DEG states, implying a high degree of spin polarization in modest magnetic fields at cryogeni c temperatures. (C) 1997 American Institute of Physics.