OPTICALLY DETECTED MAGNETIC-RESONANCE OF EXCESS ELECTRONS IN TYPE-I QUANTUM-WELLS WITH A LOW-DENSITY ELECTRON-GAS

Optically detected magnetic resonance is applied to study the fast opt ical transition processes on a ns time scale with the microwave-induce d magnetic transition rate much lower than the optical transition rate . The spin resonance of excess electrons (EESR) is observed with the d etection on either the direct exciton or the negatively charged excito n X- emission in type-I CdTe/Cd1-xMgxTe quantum wells with excess elec trons of low density. It is found that the electron-spin-dependent and electron-spin-conserved formation and recombination of X- make the op tical detection of EESR feasible.