Interest in the hybrid organic-inorganic perovskite semiconductors has skyrocketed in recent years due to unprecedented high performance as solution-processable absorber layers in solar cells [1]. These materials also have potential for applications in semiconductor spintronics due to their large spin-orbit interaction. Theoretical studies predict a large Rashba spin splitting [2], and recent experiments have revealed a large photoinduced magnetization [3-5] and spin-dependent optical Stark effect [6], yet still relatively little is known about the spin-related properties of these materials. Here we report polarization-dependent pump probe studies of the 2D perovskite butylammonium methylammonium lead iodide. Our experiments indicate a strong influence of the Rashba spin splitting on the carrier kinetics in this system, consistent with our recent four-wave mixing studies of bulk CH3NH3PbI3.
[1] https://www.nrel.gov/pv/assets/images/efficiency_chart.jpg.
[2] M. Kepenekian and J. Even, J. Phys. Chem. Lett. 8, 3362 (2017).
[3] D. Giovanni et al. Nano Lett. 15, 1553 (2015).
[4] C. Zhang et al. Nat. Phys. 11, 427 (2015).
[5] P. Odenthal et al. Nat. Phys. 13, 894 (2017).
[6] D. Giovanni et al. Science Advances 2, e1600477 (2016).
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