Spectroscopic investigation of a gas-discharge pulse plasma of a Cu+Ne laser

Abstract

In low-dimensional systems dynamical nuclear polarization is a sensitive tool for the study of electron-nuclear interaction. We report on Overhauser-shift experiments on the PDEG of AI,Ga,.,As/GaAs heterostructures. The conduction electron spin resonance has been electrically detected via the associated change of the magnetoresistance R,,, and dynamical nuclear polarization (the Overhauser elfect) has been achieved by saturating the conduction electron spin resonance (CESR). In order to investigate the nuclear spin relaxation the samples were embedded in an RF coil and the temporal decay of the Overhauser shift was followed with and without additional NMR irradiation. Different spin-lanice relaxation times of '*Ga, "Ga and "As could be detected and small deviations from a pure Korringa behaviour have been found.