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We report experimental results of the effect of Ka-band microwave on the spindynamics of electrons in a 2D electron system in a GaAs/Al0.35Ga0.65Asheterostructure, via time-resolved Kerr rotation measurements. While themicrowave reduces the transverse spin lifetime of the bulk GaAs when itsfrequency is close to the Zeeman splitting of the electrons in the magneticfield, it significantly increases that of electrons in the 2D electron system,from 745 ps to 1213 ps. Such a microwave-enhanced spin lifetime is ascribed tothe microwave-induced electron scattering which leads to a motional narrowingof spins via DP mechanism.

Effect of Ka-band Microwave on the spin dynamics of electrons in a GaAs/Al0.35Ga0.65As heterostructure