Abstract
A consistent theory of exciton interaction which affects the coherent exciton spin dynamics and its dephasing is constructed. For the low-density exciton regime, the nonlinear equation for the exciton polarization adds to the Gross–Pitaevskii equation spin-dependent correlation terms, permitting an examination of the correlation effects on the optically excited spin dynamics. We apply the theory to investigate the collective spin oscillations under optical excitation.
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