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We report theoretical and experimental studies of the longitudinal electronspin and orbital relaxation time of interstitial Li donors in $^{28}$Si. Wepredict that despite the near-degeneracy of the ground-state manifold the spinrelaxation times are extremely long for the temperatures below 0.3 K. Thisprediction is based on a new finding of the chiral symmetry of the donorstates, which presists in the presence of random strains and magnetic fieldsparallel to one of the cubic axes. Experimentally observed kinetics ofmagnetization reversal at 2.1 K and 4.5 K are in a very close agreement withthe theory. To explain these kinetics we introduced a new mechanism of spindecoherence based on a combination of a small off-site displacement of the Liatom and an umklapp phonon process. Both these factors weakly break chiralsymmetry and enable the long-term spin relaxation.

Chiral Symmetry and Electron Spin Relaxation of Lithium Donors in Silicon