NUCLEAR-SPIN DIFFUSION VIA SPIN-EXCITONS IN THE QUANTUM HALL-EFFECT REGIME

Nuclear-spin diffusion, via exchange of spin-excitons, in two-dimensional electron systems under strong magnetic field is considered. It is shown that the nuclear spin polarization can be transported on distance d, large compared to the magnetic length. l(B). This leads to new possibilities of studying electron interactions in sufficiently dean heterojunctions, where impurity scattering and long-range potential fluctuations are too weak to generate significant relaxation rate for the nuclear spins.