In the quest to understand (and to make use of) spin effects in mesoscopic systems, the development of new experimental techniques will play a key role. In this review, we will describe some recent work using Optically Pumped Nuclear Magnetic Resonance (OPNMR), a novel spectroscopy that has proven to be an useful probe of electron spin physics in the quantum Hall regimes. We will show: (1) the OPNMR signal from a single GaAs quantum well, (2) the 'motionally narrowed' lineshape reflects the variation of the electron density across the similar to 300 Angstrom well, and (3) the dramatic changes in the lineshape which provide evidence for Skyrmion localization along the plane of the well. (C) 2001 Elsevier Science Ltd. All rights reserved. References: 70
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