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Partial circularly polarized photoluminescence with polarization degree of 2% from CH ₃ NH ₃ PbBr ₃ film at 77 K is observed, excited using a circularly polarized 532 nm laser. Moreover, the Hanle effect is measured to study spin relaxation in CH ₃ NH ₃ PbBr ₃ film, yielding a spin lifetime of ∼240 ps at 77 K.
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Wang et al. (2018) studied this question.
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