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A theory of electron spin-flip Raman scattering (SFRS) is presented thatdescribes the Raman spectral signals shifted by both single and twice theelectron Zeeman energy under nearly resonant excitation of the heavy holeexcitons in semiconductor nanoplatelets. We analyze the spin structure ofphotoexcited intermediate states, derive compound matrix elements of thespin-flip scattering and obtain polarization properties of the one- andtwo-electron SFRS common for all the intermediate states. We show that, in theresonant scattering process under consideration, the complexes "exciton pluslocalized resident electrons" play the role of main intermediate states ratherthan tightly bound trion states. It is demonstrated that, in addition to thedirect photoexcitation (and similar photorecombination) channel, there isanother indirect channel contributing to the SFRS process. In the indirectchannel, the photohole forms the exciton state with the resident electronremoved from the localization site while the photoelectron becomes localized onthis site. The theoretical results are compared with recent experimentalfindings for ensembles of CdSe nanoplatelets.

Theory of single and double electron spin-flip Raman scattering in semiconductor nanoplatelets