Optical spectroscopy of magnetic 2D electron gases at the Los Alamos pulsed magnetic field facility

A brief overview of the magnet technologies at the pulsed field facility at Los Alamos is presented, focusing on the experimental capabilities made po ssible by the unique generator-driven 60 T long-pulse magnet. Optical spect roscopy is one such beneficiary, and recent measurements of semiconductor s ystems are discussed, including studies of magnetic-disorder annealing in d iluted magnetic semiconductors, "dark" excitons in CdSe quantum dots, and i n particular, studies of negatively-charged exciton states in magnetic 2D e lectron gases. Here, the huge Zeeman energy inherent in these magnetically- doped II-VI materials results in a completely spin-polarized electron gas ( even at low magnetic fields), and drives an apparent instability of the sin glet (spin antiparallel) electrons that are bound to the photohole. (C) 200 1 Elsevier Science B.V. All rights reserved.