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We study the neutral exciton energy spectrum fine structure and its spin dephasing in transition metal dichalcogenides such as MoS₂. The interaction of the mechanical exciton with its macroscopic longitudinal electric field is taken into account. The splitting between the longitudinal and transverse excitons is calculated by means of the both electrodynamical approach and k perturbation theory. This long-range exciton exchange interaction can induce valley polarization decay. The estimated exciton spin dephasing time is in the picosecond range, in agreement with available experimental data.
Glazov et al. (Thu,) studied this question.
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