Abstract
Recently, the double spin-flip Raman scattering with simultaneous spin reversal of nonequilibrium, localized, and long-lived electrons and holes has been observed in semiconductor perovskites. The authors propose as mechanisms responsible for the double spin-flip processes (i) optical excitation of a localized exciton and its exchange interaction with localized particles, (ii) the process involving biexciton as a resonant intermediate state, and (iii) direct excitation of exciton-polaritons and their scattering by localized carriers. The conditions are discussed, under which the efficiency of double and triple spin-flip scattering can be comparable to that of the first-order process.
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