Partial circularly polarized photoluminescence (CPL) with a polarization degree (P) of 2% from CH₃NH₃PbBr₃ film at 77 K is observed, excited by a circularly polarized 532 nm laser. However, P decreases to 0.3% when excited using a circularly polarized 447 nm laser, and to zero using a linear polarized laser. The Hanle effect is measured to study spin relaxation in CH₃NH₃PbBr₃ film, yielding a spin lifetime of ∼240 ps at 77 K, which however becomes one order of magnitude smaller when the temperature increases to 110 K. The existence of a CPL that is dependent on the helicity of the excitation laser, and the unexpectedly long spin lifetime with large spin–orbit coupling, suggest the potential of hybrid perovskites for spintronic applications.

中文翻译：

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有机-无机杂化钙钛矿薄膜中自旋弛豫的圆偏振光致发光和Hanle效应测量†

观察到在37 K下由CH ₃ NH ₃ PbBr ₃膜产生的偏振度（P）为2％的部分圆偏振光致发光（CPL），该光由圆偏振532 nm激光激发。但是，当使用圆偏振447 nm激光激发时，P降低到0.3％，而使用线性偏振激光激发时P降低到零。测量Hanle效应以研究CH ₃ NH ₃ PbBr _3中的自旋弛豫 薄膜，在77 K时产生约240 ps的自旋寿命，然而，当温度升至110 K时，自旋寿命变小了一个数量级。CPL的存在取决于激发激光的螺旋度，并且出乎意料的长大自旋轨道耦合的自旋寿命表明了复合钙钛矿在自旋电子学应用中的潜力。