Spin or valley degrees of freedom hold promise for next-generation spintronics. Nonetheless, the macroscopic coherent spin current formations are still hindered by rapid dephasing due to electron scattering, specifically at room temperature. Exciton polaritons offer excellent platforms for spin-optronic devices via the optical spin Hall effect. However, this effect could neither be unequivocally observed at room temperature nor be exploited for practical spintronic devices due to the presence of strong thermal fluctuations or large linear spin splitting. Here we report the observation of room-temperature optical spin Hall effect of exciton polaritons, with the spin current flow over 60 μm in a formamidinium lead bromide perovskite microcavity. We provide direct evidence of long-range coherence in the flow of polaritons and the spin current carried by them. Leveraging the spin Hall transport of polaritons, we further demonstrate two polaritonic devices, namely, a NOT gate and a spin-polarized beamsplitter, advancing the frontier of room-temperature polaritonics in perovskite microcavities.

自旋或谷自由度为下一代自旋电子学带来了希望。尽管如此，宏观相干自旋电流的形成仍然受到电子散射引起的快速消融的阻碍，特别是在室温下。激子极化激元通过光学自旋霍尔效应为自旋光电器件提供了出色的平台。然而，由于存在强烈的热波动或大的线性自旋分裂，这种效应既不能在室温下明确观察到，也不能用于实际的自旋电子器件。在这里，我们报告了激子极化激元化物在室温光学自旋霍尔效应的观察结果，在甲脒溴化铅钙钛矿微腔中，自旋电流超过 60 μm。我们提供了极化激元流动及其携带的自旋电流中长程相干性的直接证据。利用极化激元的自旋霍尔传输，我们进一步展示了两个极化器件，即 NOT 门和自旋极化分光镜，推进了钙钛矿微腔中室温极化极化器的前沿。