We studied spin dynamics of charge carriers in the superlattice-like Ruddlesden-Popper hybrid lead iodide perovskite semiconductors, 2D (BA)₂(MA)Pb₂I₇ (with MA = CH₃NH₃, and BA = CH₃(CH₂)₃NH₃), and 3D MAPbI₃ using the magnetic field effect (MFE) on conductivity and electroluminescence in their light emitting diodes (LEDs) at cryogenic temperatures. The semiconductors with distinct structural/bulk inversion symmetry breaking, when combined with colossal intrinsic spin–orbit coupling (SOC), theoretically give rise to giant Rashba-type SOC. We found that the magneto-conductance (MC) magnitude increases monotonically with the emission intensity and saturates at ≈0.05% and 0.11% for the MAPbI₃ and (BA)₂(MA)Pb₂I₇, respectively. The magneto-electroluminescence (MEL) response with similar line shapes as the MC response has a significantly larger magnitude, and essentially stays constant at ≈0.22% and ≈0.20% for MAPbI₃ and (BA)₂(MA)Pb₂I₇, respectively. The sign and magnitude of the MC and MEL responses can be quantitatively explained in the framework of the Δg-based excitonic model using rate equations. Remarkably, the width of the MEL response in those materials linearly increases with increasing the applied electric field, where the Rashba coefficient in (BA)₂(MA)Pb₂I₇ is estimated to be about 7 times larger than that in MAPbI₃. Our studies might have significant impact on future development of electrically-controlled spin logic devices via Rashba-like effects.

我们研究了超晶格状Ruddlesden-Popper混合碘化铅钙钛矿，2D（BA）₂（MA）Pb ₂ I ₇（其中MA = CH ₃ NH ₃和BA = CH ₃（CH ₂）₃ NH ₃）和3D MAPbI ₃在低温下使用磁场效应（MFE）对其发光二极管（LED）的电导率和电致发光进行测试。具有独特的结构/本体反演对称性破坏的半导体，当与巨大的本征自旋-轨道耦合（SOC）结合使用时，理论上会产生巨大的Rashba型SOC。我们发现，磁导（MC）量级随发射强度单调增加，并且对于MAPbI ₃和（BA）₂（MA）Pb ₂ I ₇分别达到≈0.05％和0.11％。与MC响应具有相似线形的磁电致发光（MEL）响应具有明显更大的幅度，并且对于MAPbI ₃基本上保持恒定在≈0.22％和≈0.20％和（BA）₂（MA）Pb ₂ I ₇。MC和MEL响应的符号和强度可以使用速率方程在基于Δg的激子模型的框架中进行定量解释。值得注意的是，这些材料中的MEL响应宽度随着施加电场的增加而线性增加，其中（BA）₂（MA）Pb ₂ I ₇中的Rashba系数估计约为MAPbI ₃中的Rashba系数的7倍。我们的研究可能通过类Rashba效应对电控自旋逻辑器件的未来发展产生重大影响。