article published yes Artem Volosniev author 37D278BC-F248-11E8-B48F-1D18A9856A870000-0003-0393-5525 Abhishek Shiva Kumar author 5e9a6931-eb97-11eb-a6c2-e96f7058d77a Dusan Lorenc author 40D8A3E6-F248-11E8-B48F-1D18A9856A87 Younes Ashourishokri author e32c111f-f6e0-11ea-865d-eb955baea334 Ayan A. Zhumekenov author Osman M. Bakr author Mikhail Lemeshko author 37CB05FA-F248-11E8-B48F-1D18A9856A870000-0002-6990-7802 Zhanybek Alpichshev author 45E67A2A-F248-11E8-B48F-1D18A9856A870000-0002-7183-5203 GradSch department ZhAl department MiLe department Lead halide perovskites enjoy a number of remarkable optoelectronic properties. To explain their origin, it is necessary to study how electromagnetic fields interact with these systems. We address this problem here by studying two classical quantities: Faraday rotation and the complex refractive index in a paradigmatic perovskite CH3NH3PbBr3 in a broad wavelength range. We find that the minimal coupling of electromagnetic fields to the k⋅p Hamiltonian is insufficient to describe the observed data even on the qualitative level. To amend this, we demonstrate that there exists a relevant atomic-level coupling between electromagnetic fields and the spin degree of freedom. This spin-electric coupling allows for quantitative description of a number of previous as well as present experimental data. In particular, we use it here to show that the Faraday effect in lead halide perovskites is dominated by the Zeeman splitting of the energy levels and has a substantial beyond-Becquerel contribution. Finally, we present general symmetry-based phenomenological arguments that in the low-energy limit our effective model includes all basis coupling terms to the electromagnetic field in the linear order. American Physical Society2023 eng General Physics and Astronomy 0031-9007 1079-7114 2203.09443 36962044 00098243590000210.1103/physrevlett.130.106901 13010 Volosniev, Artem, et al. “Spin-Electric Coupling in Lead Halide Perovskites.” <i>Physical Review Letters</i>, vol. 130, no. 10, 106901, American Physical Society, 2023, doi:<a href="https://doi.org/10.1103/physrevlett.130.106901">10.1103/physrevlett.130.106901</a>. Volosniev A, Shiva Kumar A, Lorenc D, Ashourishokri Y, Zhumekenov AA, Bakr OM, Lemeshko M, Alpichshev Z. 2023. Spin-electric coupling in lead halide perovskites. Physical Review Letters. 130(10), 106901. Volosniev, Artem, Abhishek Shiva Kumar, Dusan Lorenc, Younes Ashourishokri, Ayan A. Zhumekenov, Osman M. Bakr, Mikhail Lemeshko, and Zhanybek Alpichshev. “Spin-Electric Coupling in Lead Halide Perovskites.” <i>Physical Review Letters</i>. American Physical Society, 2023. <a href="https://doi.org/10.1103/physrevlett.130.106901">https://doi.org/10.1103/physrevlett.130.106901</a>. A. Volosniev <i>et al.</i>, “Spin-electric coupling in lead halide perovskites,” <i>Physical Review Letters</i>, vol. 130, no. 10. American Physical Society, 2023. Volosniev A, Shiva Kumar A, Lorenc D, et al. Spin-electric coupling in lead halide perovskites. <i>Physical Review Letters</i>. 2023;130(10). doi:<a href="https://doi.org/10.1103/physrevlett.130.106901">10.1103/physrevlett.130.106901</a> Volosniev, A., Shiva Kumar, A., Lorenc, D., Ashourishokri, Y., Zhumekenov, A. A., Bakr, O. M., … Alpichshev, Z. (2023). Spin-electric coupling in lead halide perovskites. <i>Physical Review Letters</i>. American Physical Society. <a href="https://doi.org/10.1103/physrevlett.130.106901">https://doi.org/10.1103/physrevlett.130.106901</a> A. Volosniev, A. Shiva Kumar, D. Lorenc, Y. Ashourishokri, A.A. Zhumekenov, O.M. Bakr, M. Lemeshko, Z. Alpichshev, Physical Review Letters 130 (2023). 127232023-03-14T13:11:59Z2025-04-23T08:53:33Z