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Abstract
The ${T}_{1}$ spin lifetime of a lightly doped $n$-type GaAs sample has been measured via time-resolved polarization spectroscopy under a number of temperature and magnetic field conditions. Lifetimes up to $19\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{s}$ have been measured. The magnetic field dependence of ${T}_{1}$ shows a nonmonotonic behavior, where the spin lifetime first increases, then decreases, then increases again with field. The initial increase in ${T}_{1}$ is understood to be due to correlation between electrons localized on donors. The decrease in ${T}_{1}$ is likely due to phonon-related spin-orbit relaxation. The final increase in ${T}_{1}$ with $B$ indicates a suppression of the spin-orbit relaxation that may involve a level-crossing related cusp in the Rashba or Dresselhaus contributions to relaxation, or may arise from an unknown source.
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