A brief overview of the magnet technologies at the pulsed field facility at Los Alamos is presented, focusing on the experimental capabilities made possible by the unique generator-driven 60 T long-pulse magnet. Optical spectroscopy is one such beneficiary, and recent measurements of semiconductor systems are discussed, including studies of magnetic-disorder annealing in diluted magnetic semiconductors, "dark" excitons in CdSe quantum dots, and in particular, studies of negatively-charged exciton states in magnetic 2D electron 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 singlet (spin antiparallel) electrons that are bound to the photohole.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering