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We have studied the spin dynamics of a dense two-dimensional electron gasconfined in a GaAs/AlGaAs triple quantum well by using time-resolved Kerrrotation and resonant spin amplification. Strong anisotropy of the spinrelaxation time up to a factor of 10 was found between the electron spinsoriented in-plane and out-of-plane when the excitation energy is tuned to anexciton bound to neutral donor transition. We model this anisotropy using aninternal magnetic field and the inhomogeneity of the electron g-factor. Thedata analysis allows us to determine the direction and magnitude of thisinternal field in the range of a few mT for our studied structure, whichdecreases with the sample temperature and optical power. The dependence of theanisotropic spin relaxation was directly measured as a function of severalexperimental parameters: excitation wavelength, sample temperature, pump-probetime delay, and pump power.

Large anisotropic spin relaxation time of exciton bound to donor states in triple quantum wells